Marian Smoluchowski
Institute of Physics

Jagiellonian University

Publications

ARTICLES CONFERENCE PROCEEDINGS

1. Three-body breakup in deuteron-deuteron collisions at 160 MeV including quasifree scattering
   I. Ciepal, G. Khatri, K. Bodek, A. Deltuva, N. Kalantar-Nayestanaki, S. Kistryn, B. Klos, A. Kozela, J. Kubos, P. Kulessa, A. Lobejko, A. Magiera, J. Messchendorp, I. Mazumdar, W. Parol, R. Ramazani-Sharifabadi, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wilczek, B. Wloch, A. Wronska, J. Zejma
   abstract

   PHYSICAL REVIEW C 100:2 024003 (2019)
   A set of differential cross section of the three-body H-2(d, dp)n breakup reaction at 160-MeV deuteron beam energy is presented for 147 configurations covering a wide kinematical region around quasifree scattering. The experiment was performed at KVI in Groningen, the Netherlands, using the BINA detector. The cross-section data have been normalized to the H-2(d, d)H-2 elastic-scattering cross section. The data are compared to the results of recent single-scattering approximation (SSA) calculations for three-cluster breakup in deuteron-deuteron collisions. This comparison shows that SSA provides the correct order of magnitude of the cross sections. The studied energy is probably too low to meet the SSA assumptions which prevents better accuracy of the description.
2. Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter
   J. Adamczewski-Musch, O. Arnold, ET. Atomssa, C. Behnke, A. Belounnas, A. Belyaev, JC. Berger-Chen, J. Biernat, A. Blanco, C. Blume, M. Bohmer, S. Chernenko, L. Chlad, P. Chudoba, I. Ciepal, C. Deveaux, D. Dittert, J. Dreyer, E. Epple, L. Fabbietti, O. Fateev, P. Fonte, C. Franco, J. Friese, I. Frohlich, T. Galatyuk, JA. Garzon, R. Gernhauser, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, C. Hohne, R. Holzmann, A. Ierusalimov, A. Ivashkin, B. Kampfer, B. Kardan, I. Koenig, W. Koenig, BW. Kolb, G. Korcyl, G. Kornakov, F. Kornas, R. Kotte, J. Kubos, A. Kugler, T. Kunz, A. Kurepin, A. Kurilkin, P. Kurilkin, V. Ladygin, R. Lalik, K. Lapidus, A. Lebedev, S. Linev, L. Lopes, M. Lorenz, T. Mahmoud, L. Maier, A. Malige, J. Markert, S. Maurus, V. Metag, J. Michel, DM. Mihaylov, et al.
   abstract

   PHYSICAL REVIEW LETTERS 123:2 022002 (2019)
   We present the first observation of K- and phi absorption within nuclear matter by means of pi(-)-induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studied with HADES at SIS18/GSI. The double ratio (K-/K+)(W)/(K-/K+)(C) is found to be 0.319 +/- 0.009(stat)(-0.012)(+0.014)(syst) indicating a larger absorption of K- in heavier targets as compared to lighter ones. The measured phi/K- ratios in pi(-) + C and pi(-) + W reactions within the HADES acceptance are found to be equal to 0.55 +/- 0.04(stat)(-0.07)(+0.06) (syst) and to 0.63 +/- 0.06(stat)(-0.11)(+0.11)(syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the phi meson in nuclear medium is strongly coupled to the K- dynamics. The large difference in the. production off C and W nuclei is discussed in terms of a strong phi N in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.
3. Studies of Deuteron Breakup Reactions in Deuteron-Deuteron Collisions at 160MeV with BINA
   I. Ciepal, K. Bodek, N. Kalantar-Nayestanaki, G. Khatri, S. Kistryn, B. Klos, A. Kozela, J. Kubos, P. Kulessa, A. Lobejko, A. Magiera, I. Mazumdar, J. Messchendorp, W. Parol, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wilczek, B. Wloch, A. Wronska, J. Zejma
   abstract

   FEW-BODY SYSTEMS 60:2 UNSP 44 (2019)
   A rich set of differential cross section of the three-body 2H(d,dp)n breakup reaction at 160MeV deuteron beam energy has been measured over a large range of the available phase space. The experiment was performed at KVI in Groningen, the Netherlands, using the BINA detector. The cross-section data for the breakup reaction have been normalized to the simultaneously measured 2H(d,d)2H elastic scattering cross section. The breakup cross sections obtained for 147 kinematically complete configurations near the quasi-free scattering kinematics are compared to the recent approximate calculations for the three-cluster breakup in deuteron-deuteron collisions. The cross sections for 294 kinematic configurations of the quasi-free scattering regime, for which no theoretical calculations exist, are also presented. Besides the three-body breakup, semi-inclusive energy distributions for the four-body 2H(d,pp)nn breakup are reported.
4. Collective flow and correlations measurements with HADES in Au plus Au collisions at 1.23 AGeV
   B. Kardan, J. Adamczewski-Musch, O. Arnold, B. Arnoldi-Meadows, A. Belounnas, A. Belyaev, J. Biernat, A. Blanco, C. Blume, M. Bohmer, P. Bordalo, L. Chlad, P. Chudoba, I. Ciepal, C. Deveaux, D. Dittert, J. Dreyer, L. Fabbietti, O. Fateev, P. Fonte, C. Franco, J. Friese, I. Frohlich, T. Galatyuk, JA. Garzon, R. Gernhauser, A. Gillitzer, O. Golosov, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, C. Hohne, R. Holzmann, A. Ierusalimov, V. Ivanov, A. Ivashkin, B. Kampfer, M. Kajetanowicz, KH. Kampert, B. Kardan, V. Khomyakov, I. Koenig, W. Koenig, G. Korcyl, G. Kornakov, F. Kornas, R. Kotte, A. Kozela, J. Kubos, A. Kugler, T. Kunz, P. Kurilkin, V. Kushpil, V. Ladygin, R. Lalik, A. Lebedev, S. Linev, L. Lopes, M. Lorenz, G. Lykasov, T. Mahmoud, A. Malakhov, J. Markert, S. Maurus, et al.
   abstract

   PROC. NUCLEAR PHYSICS A 982 p. 431-434 (2019)
   The HADES experiment provides a large acceptance combined with a high mass resolution and therefore makes it possible to study dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the high statistics of seven billion Au+Au collisions at 1.23 AGeV recorded in 2012 the investigation of collective effects and particle correlations is possible with unprecedented accuracy. We present multi-differential data on directed (v(1)) and elliptic (v(2)) flow, and the first measurement of triangular flow (v(3)), of protons and deuterons.
5. Multi-differential pattern of low-mass e(+)e(-) excess from root S-NN=2.4 GeV Au+Au collisions with HADES
   S. Harabasz, J. Adamczewski-Musch, O. Arnold, B. Arnoldi-Meadows, A. Belounnas, A. Belyaev, J. Biernat, A. Blanco, C. Blume, M. Bohmer, P. Bordalo, L. Chlad, P. Chudoba, I. Ciepal, C. Deveaux, D. Dittert, J. Dreyer, L. Fabbietti, O. Fateev, P. Fonte, C. Franco, J. Friese, I. Frohlich, T. Galatyuk, JA. Garzon, R. Gernhauser, A. Gillitzer, O. Golosov, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, C. Hohne, R. Holzmann, A. Ierusalimov, V. Ivanov, A. Ivashkin, B. Kampfer, M. Kajetanowicz, KH. Kampert, B. Kardan, V. Khomyakov, I. Koenig, W. Koenig, G. Korcyl, G. Kornakov, F. Kornas, R. Kotte, A. Kozela, J. Kubos, A. Kugler, T. Kunz, P. Kurilkin, V. Kushpil, V. Ladygin, R. Lalik, A. Lebedev, S. Linev, L. Lopes, M. Lorenz, G. Lykasov, T. Mahmoud, A. Malakhov, J. Markert, S. Maurus, et al.
   abstract

   PROC. NUCLEAR PHYSICS A 982 p. 771-774 (2019)
   The matter formed in central heavy-ion collisions at a few GeV per nucleon is commonly understood as resonance matter, a gas of nucleons and excited baryon states with a substantial contribution from mesonic, mostly pionic excitations. Yet, in the initial phase of the reaction the system is compressed to beyond nuclear ground state density and hence substantial modifications of the hadron properties are expected to occur. The spectral distribution of virtual photons measured in Au+Au collisions at 2.4 GeV center of mass energy indicates strong medium effects beyond pure superposition of individual NN collisions. We present multi-differential distributions of low-mass electron pairs. This radiation is remarkably well described assuming emission from a thermalized system. To gain deeper understanding of the microscopic origin of the radiation, we extracted the centrality dependent true (not blue-shifted) temperature, its azimuthal distribution, as well as mass-dependent effective slope parameter. Virtual photon spectra are confronted with available model calculations.
6. Sub-threshold strangeness production measured with HADES
   G. Kornakov, J. Adamczewski-Musch, O. Arnold, B. Arnoldi-Meadows, A. Belounnas, A. Belyaev, J. Biernat, A. Blanco, C. Blume, M. Bohmer, P. Bordalo, L. Chlad, P. Chudoba, I. Ciepal, C. Deveaux, D. Dittert, J. Dreyer, L. Fabbietti, O. Fateev, P. Fonte, C. Franco, J. Friese, I. Frohlich, T. Galatyuk, JA. Garzon, R. Gernhauser, A. Gillitzer, O. Golosov, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, C. Hohne, R. Holzmann, A. Ierusalimov, V. Ivanov, A. Ivashkin, B. Kampfer, M. Kajetanowicz, KH. Kampert, B. Kardan, V. Khomyakov, I. Koenig, W. Koenig, G. Korcyl, F. Kornas, R. Kotte, A. Kozela, J. Kubos, A. Kugler, T. Kunz, P. Kurilkin, V. Kushpil, V. Ladygin, R. Lalik, A. Lebedev, S. Linev, L. Lopes, M. Lorenz, G. Lykasov, T. Mahmoud, A. Malakhov, J. Markert, S. Maurus, V. Metag, et al.
   abstract

   PROC. NUCLEAR PHYSICS A 982 p. 803-806 (2019)
   At energies below root S-NN approximate to 2.55 GeV, strange quarks cannot be produced in binary nucleon-nucleon collisions because of the higher production threshold of the lightest hadrons carrying strangeness. Hence, the investigation of sub-threshold strangeness production in heavy-ion collisions is one of the most promising probes, to access the properties of the created system, as the missing energy must be provided by the latter one. For the first time, a nearly complete set of strange particles has been reconstructed in the 40% most central Au+Au collisions at. root S-NN = 2.42 GeV. The data sample includes multi-differential representations of charged and neutral particles containing strangeness (K-+/-,K-s(0), phi, Lambda). To achieve a better understanding of strangeness production the properties of the short-lived resonances have to be investigated. The first steps in this direction are presented here, including the reconstruction of baryon resonances using a new iterative technique, comparison to microscopic transport model calculations and interpretation of the pion transverse momentum distribution.
7. Investigation of the cross section for dd elastic scattering and dd -> n He-3 reactions at 160 MeV
   I. Ciepal, J. Kubos, K. Bodek, N. Kalantar-Nayestanaki, G. Khatri, S. Kistryn, B. Klos, A. Kozela, P. Kulessa, A. Lobejko, A. Magiera, J. Messchendorp, I. Mazumdar, W. Parol, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wilczek, B. Wloch, A. Wronska, J. Zejma
   abstract

   PHYSICAL REVIEW C 99:1 014620 (2019)
   Differential cross sections of H-2(d, d)H-2 elastic scattering and proton transfer H-2(d,He-3)n reactions at 160 MeV beam energy have been obtained. They have been normalized relative to the existing cross-section data for the H-2(d, d)H-2 elastic scattering at 180 and 130 MeV, benefitting from the negligible energy dependence of this observable at certain range of the four-momentum transfer. The experiment was performed at KVI in Groningen, the Netherlands, using the BINA detector. The elastic scattering data are compared to theoretical predictions based on the lowest-order term in the Neumann series expansion for four-nucleon transition operators. The calculations underpredict the data. The data presented in this paper can be used to validate the future theoretical findings.
8. Time-Like Baryon Transitions studies with HADES
   B. Ramstein, J. Adamczewski-Musch, O. Arnold, B. Arnoldi-Meadows, A. Belounnas, A. Belyaev, J. Biernat, A. Blanco, C. Blume, M. Bohmer, P. Bordalo, L. Chlad, P. Chudoba, I. Ciepal, C. Deveaux, D. Dittert, J. Dreyer, L. Fabbietti, O. Fateev, P. Fonte, C. Franco, J. Friese, I. Frohlich, T. Galatyuk, JA. Garzon, R. Gernhauser, A. Gillitzer, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, M. Himmelreich, C. Hohne, R. Holzmann, A. Ierusalimov, V. Ivanov, A. Ivashkin, B. Kampfer, M. Kajetanowicz, KH. Kampert, T. Karavicheva, B. Kardan, V. Khomyakov, I. Koenig, W. Koenig, G. Korcyl, G. Kornakov, F. Kornas, R. Kotte, A. Kozela, J. Kubos, A. Kugler, T. Kunz, A. Kurepin, P. Kurilkin, V. Kushpil, V. Ladygin, R. Lalik, A. Lebedev, S. Linev, M. Liu, L. Lopes, M. Lorenz, G. Lykasov, et al.
   abstract

   PROC. EPJ Web of Conferences, MESON 2018 - 15TH INTERNATIONAL WORKSHOP ON MESON PHYSICS 199 UNSP 01008 (2019)
   The HADES collaboration uses the e(+)e(-) production as a probe of the resonance matter produced in collisions at incident energies of 1-3.5 GeV/nucleon at GSI. Elementary reactions provide useful references for these studies and give information on resonance Dalitz decays (R -> Ne(+)e(-)). Such processes are sensitive to the structure of time-like electromagnetic baryon transitions in a kinematic range where (off-shell) vector mesons play a crucial role. Results obtained in proton-proton reactions and in a commissioning pion-beam experiment are reported and prospects for future pion beam experiments and for first hyperon Dalitz decay measurements are described. The connection with the investigations of medium effects to be continued with HADES in the next years at SIS18 and SIS100 is also discussed.
9. Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY
   R. Adlarson, WAC. Collaboration, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, A. Bondar, M. Buescher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, R. Fedorets, K. Foehl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Huesken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, G. Khatri, A. Khoukaz, A. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, R. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, R. Marciniewski, B. Marianski, HP. Morsch, R. Moskal, H. Ohm, W. Parol, EP. Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, et al.
   abstract

   PHYSICS LETTERS B 784 p. 378-384 (2018)
   We report on the search for the rare decay eta -> pi(0)e(+)e(-) which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively. (c) 2018 The Author. Published by Elsevier B.V.
10. Isotensor Dibaryon in the pp -> pp pi(+)pi(-) Reaction?
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, W. Parol, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, V. Serdyuk, B. Shwartz, T. Skorodko, M. Skurzok, J. Smyrski, et al.
    abstract

    PHYSICAL REVIEW LETTERS 121:5 052001 (2018)
    Exclusive measurements of the quasifree pp -> pp pi(+)pi(-) reaction have been carried out at WASA@ COSY by means of pd collisions at T-p = 1.2 GeV. Total and differential cross sections have been extracted covering the energy region T-p = 1.08-1.36 GeV, which is the region of N* (1440) and Delta(123)Delta(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor Delta N dibaryon resonance with I(J(P)) = 2(1(+)) produced associatedly with a pion is able to overcome these deficiencies.
11. Total and differential cross sections of eta-production in proton-deuteron fusion for excess energies between Q(eta)=13 MeV and Q(eta)=81 MeV
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erveno, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, G. Khatri, A. Khoukaz, A. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, W. Parol, EP. del Rio, NM. Piskunovu, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    PHYSICS LETTERS B 782 p. 297-304 (2018)
    New data on both total and differential cross sections of the production of eta mesons in proton-deuteron fusion to He-3 eta in the excess energy region 13.6 MeV <= Q(eta) <= 80.9 MeV are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum Julich, using a proton beam at 15 different beam momenta between p(p) = 1.60 GeV/c and p(p) = 1.74 GeV/c. While significant structure of the total cross section is observed in the energy region 20 MeV less than or similar to Q(eta) less than or similar to 60 MeV, a previously reported sharp variation around Q(eta) approximate to 50 MeV cannot be confirmed. Angular distributions show the typical forward- peaking that was noted earlier. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a wide interval. (c) 2018 The Author. Published by Elsevier B.V.
12. Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi0
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, C. Hanhart, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, W. Parol, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    PHYSICS LETTERS B 781 p. 645-650 (2018)
    This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions. (C) 2018 The Author(s). Published by Elsevier B.V.
13. Spin Dependence of eta Meson Production in Proton-Proton Collisions Close to Threshold
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, SD. Bass, FS. Bergmann, M. Berlowski, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, W. Parol, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    PHYSICAL REVIEW LETTERS 120:2 022002 (2018)
    Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction (p) over right arrowp -> pp eta has been measured close to threshold to explore the analyzing power A(y). The angular distribution of A(y) is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV, signaling s-wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)(2) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the eta meson.
14. Isoscalar single-pion production in the region of Roper and d*(2380) resonances
    P. Adlarsona, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, W. Parol, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
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    abstract

    Phys. Lett. B 774 (2017) 599

    HEP: arXiv:1702.07212
    Exclusive measurements of the quasi-free pn -> pp pi(-) and pp -> pp pi(0) reactions have been performed by means of pd collisions at T-p= 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region T-p= 0.95-1.3 GeV (root s = 2.3-2.46 GeV), which includes the regions of triangle(1232), N*(1440) and d*(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below T-p = 1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance N*(1440), the strength of which shows up isolated from the triangle resonance in the isoscalar (N pi)(I=0) invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d*(2380) into the isoscalar (NN pi)(I=0) channel is found. An upper limit of 180 mu b (90% CL.) corresponding to a branching ratio of 9% has been deduced. (c) 2017 The Author(s). Published by Elsevier B.V.
15. Measurement of the omega -> pi(+)pi(-)pi(0) Dalitz plot distribution The WASA-at-COSY Collaboration
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. RudyC, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    PHYSICS LETTERS B 770 p. 418-425 (2017)
    Using the production reactions pd -> He-3 omega and pp -> pp omega, the Dalitz plot distribution for the omega -> pi(+)pi(-)pi(0)decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408 +/- 0.042) x 10(4) events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and phi. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1 sigma. The deviation is parametrised by a linear term 1+2 alpha Z, with alpha determined to be +0.147 +/- 0.036, consistent with the expectations of rho-meson-type final-state interactions of the P-wave pion pairs. (C) 2017 The Author. Published by Elsevier B.V.
16. PROBING THREE-AND FOUR-NUCLEON INTERACTIONS WITH THE DEUTERON BREAKUP REACTION
    I. Ciepal, I. Skwira-Chalot, S. Kistryn, A. Kozela, A. Magiera, E. Stephan
    abstract

    PROC. ACTA PHYSICA POLONICA B 48:3 p. 481-484 (2017)
    Research in the domain of few-nucleon systems concerns reactions involving a small number of nucleons in which observables can be compared directly to exact computational methods - rigorous solutions of the Fad-deev equations. The investigations of such systems reveal existence of various dynamical ingredients such as the three-nucleon force, the Coulomb force or relativistic effects. A large set of the cross-section data of the H-1 (d, pp)n breakup reaction obtained at energy of 130 MeV was used to trace the Coulomb force effects. Comparisons of the cross-section data with the predictions using the realistic Argonne 18 potential are presented. The new set of invariants was introduced to describe the process with three nucleons in the final state.
17. Experimental Study of Three-Nucleon Dynamics in the Dp Breakup Collisions Using the WASA Detector
    B. Klos, I. Ciepal, B. Jamroz, G. Khatri, S. Kistryn, A. Kozela, A. Magiera, W. Parol, I. Skwira-Chalot, E. Stephan
    abstract

    PROC. FEW-BODY SYSTEMS 58:2 UNSP 38 (2017)
    Until recently, all calculations of breakup observables were carried out in a non-relativistic regime. The relativistic treatment of the breakup reaction in 3N system is quite a new achievement. The detailed study of various aspects of few-nucleon system dynamics in medium energy region, with a particular emphasis on investigation of relativistic effects and their interplay with three nucleon force (3NF) becomes feasible with increasing available energy in the three nucleon system. Therefore an experiment to investigate the H-1(d, pp)n breakup cross section using a deuteron beam of 300, 340, 380 and 400 MeV and the WASA detector has been performed at COSY-Julich. The almost 4 pi geometry of the WASA detector gives an unique possibility to study variety of kinematic configurations, which reveal different sensitivity to aspects of dynamics of the three nucleon system. The main steps of the analysis, including energy calibration, PID, normalization and efficiency studies, and their impact on the final accuracy of the result, are discussed.
18. Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, E. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, NG. Kelkar, G. Kemmerling, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magierae, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    NUCLEAR PHYSICS A 959 p. 102-115 (2017)
    The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.
19. Measurements of branching ratios for eta decays into charged particles
    P. AdlarsoN, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, G. Khatri, A. Khoukaz, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, HP. Morsch, P. Moskal, H. Ohm, I. Ozerianska, EP. del Rio, NM. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, et al.
    download

    abstract

    Phys. Rev. C 94 (2016) 065206

    HEP: arXiv:1509.06588
    The WASA-at-COSY experiment has collected 3 x 10(7) events with eta mesons produced via the reaction pd -> He-3 eta at T = 1.0 GeV. Using this data set, we evaluate the branching ratios of the decays eta -> pi(+)pi(-)gamma, eta -> e(+)e(-)gamma, eta -> pi(+)pi(-)e(+)e(-), and eta -> e(+)e(-)e(+)e(-). The branching ratios are normalized to the eta -> pi(+)pi(-) pi(0) decay. In addition an upper limit on a CP-violating asymmetry in eta -> pi(+)pi(-)e(+)e(-) is extracted.
20. Search for an isospin I=3 dibaryon
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, CO. Gullstrom, L. Heijkenskjold, V. Hejny, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, G. Khatri, A. Khoukaz, O. Khreptak, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, HP. Morsch, P. Moskal, H. Ohm, EP. del Rio, NM. Piskunov, D. Prasuhnl, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schatti-Ozerianska, T. Sefzick, et al.
    abstract

    PHYSICS LETTERS B 762 p. 455-461 (2016)
    Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance d*(2380) with I(J(P)) = 3(0(+)) there should also exist a dibaryon resonance with mirrored quantum numbers I(J(P)) = 3(0(+)). We report here on a search for such a NN-decoupled state in data on the pp -> pp pi(+) pi(+) pi(-) pi(-) reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280-2500 MeV. (C) 2016 The Author(s). Published by Elsevier B.V.
21. Possibility of Measurement of Cross Section and Vector Analyzing Powers of p-3He Scattering at the Bronowice Cyclotron Center
    I. Ciepał, A. Kozela , B. Głowacz , P. Kulessa , T. Pałasz, I. Skwira-Chalot , B. Włoch
    download

    abstract

    Acta Phys. Polon. B 47 (2016) 323
    A new possibility of continuation of few-nucleon dynamics studies at medium energies has appeared together with a new facility at the Institute of Nuclear Physics PAN in Kraków ? The Bronowice Cyclotron Center (CCB). The new cyclotron PROTEUS provides a proton beam in an energy range of 70?230 MeV. Current progress in the theoretical calculations for four-nucleon (4N) systems is a main motivation to investigate p ?3He scattering. Due to the fact that the beam cannot be polarized, the only possibility to study spin observables is to build a polarized 3He target system. A planned experiment assumes the construction of a cylindrical double Pyrex cell with separated pumping and target chambers with an additional polyamide film covering apertures for the passing beam and the reaction products. To polarize 3He gas, the spin-exchange optical pumping method will be used.
22. DEUTERON-DEUTERON COLLISION AT 160 MeV
    G. Khatri, W. Parol, K. Bodek, I. Ciepal, B. Jamroz, N. Kalantar-Nayestanaki, S. Kistryn, B. Klos, A. Kozela, P. Kulessa, A. Magiera, I. Mazumdar, JG. Messchendorp, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wilczek, B. Wloch, A. Wronska, J. Zejma
    abstract

    ACTA PHYSICA POLONICA B 47:2 p. 411-416 (2016)
    The experiment was carried out using BINA detector at KVI in Groningen. For the first time, an extensive analysis of the data collected in back part of the detector is presented, where a clusterization method is utilized for angular and energy information. We also present differential cross sections for the (dd -> dpn) breakup reaction within dp quasi-free scattering limit and their comparison with first calculations based on Single Scattering Approximation (SSA) approach.
23. Experimental study of Three-Nucleon Dynamics in the dp breakup reaction
    B. Klos, I. Ciepal, G. Khatri, S. Kistryn, A. Kozela, A. Magiera, W. Paroi, I. Skwira-Chalot, E. Stephan, K. Szpik
    abstract

    PROC. EPJ Web of Conferences, 21ST INTERNATIONAL CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS 113 04004 (2016)
    An experiment to investigate the H-1(d,pp)n breakup reaction using a deuteron beam of 340, 380 and 400 MeV and the WASA detector has been performed at the Cooler Synchrotron COSY-Jtilich. The main goal was a detailed study of various aspects of few nucleon dynamics like the three nucleon force (3NF), the long-range Coulomb interaction or relativistic effects in the medium energy region. The relativistic effects and their interplay with 3NF become more important with increasing available energy in the three nucleon system. The almost 47r geometry of the WASA detector provides an unique possibility to study various aspects of dynamics. The studies of the 3N system dynamics in the breakup reaction with BINA detector are continued in the Cyclotron Center Bronowice.
24. Experimental study of three-nucleon dynamics in the dp breakup collisions using the WASA detector
    B. Klos, I. Ciepal, G. Khatri, S. Kistryn, A. Kozela, A. Magiera, W. Parol, I. Skwira-Chalot, E. Stephan
    abstract

    PROC. EPJ Web of Conferences, MESON 2016 - 14TH INTERNATIONAL WORKSHOP ON MESON PRODUCTION, PROPERTIES AND INTERACTION 1...
    An experiment to investigate the H-1(d, pp)n breakup reaction using a deuteron beam of 340, 380 and 400 MeV and the WASA detector has been performed at the Cooler Synchrotron COSY-Julich. The studied energy region, below but close to a pion production threshold, may provide information on various aspects of nuclear interactions, in particular on relativistic effects and their interplay with the three nucleon force (3NF). The almost 4 pi geometry of the WASA detector gives an unique possibility to study the different aspects of nucleon-nucleon dynamics in the three nucleon system. The main steps of the analysis, including energy calibration, PID and studied of efficiency, and their impact on final accuracy of the result, will be discussed.
25. Contribution of three nucleon force investigated in deuteron-proton breakup reaction
    W. Parol, A. Kozela, I. Ciepal, K. Bodek, B. Jamroz, N. Kalantar-Nayestanaki, G. Khatri, S. Kistryn, B. Klos, J. Kubos, P. Kulessa, A. Magiera, I. Mazumdar, JG. Messchendorp, D. Rozpedzik, A. Rusnok, I. Skwira-Chalot, E. Stephan, A. Wilczek, B. Wloch, A. Wronska, J. Zejma
    abstract

    PROC. EPJ Web of Conferences, MESON 2016 - 14TH INTERNATIONAL WORKSHOP ON MESON PRODUCTION, PROPERTIES AND INTERACTION 1...
    The elastic scattering and deuteron breakup data were collected in the experiment performed at KVI (Groningen) with use of unpolarized deuteron beam with energy of 80 MeV per nucleon, impinging on hydrogen target. The procedure applied to determine total integrated luminosity is presented. The result will be used for normalization of the differential cross section for the deuteron-proton breakup reaction.
26. Investigation of the Deuteron Breakup on Proton Target in the Forward Angular Region at 130 MeV
    I. Ciepal, B. Klos, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, PU. Sauer, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witaa, J. Zejma
    abstract

    FEW-BODY SYSTEMS 56:10 p. 665-690 (2015)
    A set of differential cross-section data of the (1) H(d, pp)n breakup reaction at 130 MeV deuteron beam energy has been measured in the domain of very forward polar angles with the use of the Germanium Wall detector at the Forschungszentrum Julich. The data obtained for over 1000 kinematical points (112 geometries) are compared with the theoretical predictions based on various models of the three-nucleon (3N) dynamics. They comprise: the realistic nucleon-nucleon potentials alone or combined with the three-nucleon force (3NF), the coupled-channel calculations with the explicit treatment of the Delta-isobar excitation and finally, the potentials derived from chiral perturbation theory. In the part of the phase space studied, the Coulomb interaction between protons has a strong impact on the differential cross section of the breakup reaction. The strongest Coulomb effects are found in regions where the relative energy of the two protons is the smallest. In these regions the data are well reproduced exclusively by calculations which include the electromagnetic repulsion between protons. In spite of the dominance of the Coulomb force in the phase space studied, the contribution of 3NF effects is also observed.
27. Experimental Investigation of Few-Nucleon Dynamics at Medium Energies
    G. Khatri, K. Bodek, I. Ciepal, N. Kalantar-Nayestanaki, S. Kistryn, B. Klos, A. Kozela, A. Magiera, I. Mazumdar, JG. Messchendorp, W. Parol, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wronska, J. Zejma
    abstract

    PROC. ACTA PHYSICA POLONICA A 127:5 p. 1529-1530 (2015)
    An experiment, with unpolarized deuteron beam of 160 MeV impinging on liquid hydrogen and liquid deuterium targets, was carried out using BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-section for the deuteron break-up reaction. The elastic scattering data were also collected alongside. We present here the methods applied in analysis of data collected in the backward part of the detector.
28. Measurement of the np -> np pi(0)pi(0) reaction in search for the recently observed d* (2380) resonance
    P. Adlarsona, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, CO. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, B. Hoistad, N. Husken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, A. Khoukaz, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, HP. Morsch, P. Moskal, H. Ohm, I. Ozerianska, EP. del Rio, NM. Piskunov, P. Podkopal, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, et al.
    abstract

    PHYSICS LETTERS B 743 p. 325-332 (2015)
    Exclusive measurements of the quasi-free np --> np pi(0)pi(0) reaction have been performed by means of dp collisions at T-d = 2.27 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region root s = (2.35-2.46) GeV, which includes the region of the ABC effect and its associated d* (2380) resonance. Adding the d* resonance amplitude to that for the conventional processes leads to a reasonable description of the data. The observed resonance effect in the total cross section is in agreement with the predictions of Faldt and Wilkin as well with those of Albadajedo and Oset. The ABC effect, i.e. the low-mass enhancement in the pi(0)pi(0)-invariant mass spectrum, is found to be very modest - if present at all, which might pose a problem to some of its interpretations. (C) 2015 The Authors. Published by Elsevier B.V.
29. COULOMB FORCE EFFECTS IN DEUTERON-PROTON BREAKUP REACTION
    I. Ciepal, B. Klos, A. Kozela, E. Stephan, S. Kistryn, A. Biegun, K. Bodek, A. Deltuva, M. Eslami-Kalantari, V. Jha, N. Kalantar-Nayestanaki, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, M. Kravcikova, P. Kulessa, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, I. Skwira-Chalot, R. Sworst, J. Urban, J. Zejma
    abstract

    PROC. ACTA PHYSICA POLONICA B 46:3 p. 459-462 (2015)
    A large set of cross-section data for the H-1 (d,pp)n breakup reaction was measured at 130 MeV deuteron beam energy with the Germanium Wall setup covering the range of very forward polar angles. In the investigated part of the phase-space, the dynamics is dominated by the Coulomb force influence. The data are compared with results of theoretical calculations based on the realistic Argonne V18 potential supplemented with the long-range electromagnetic component. The predictions also include the Urbana IX three nucleon force model. The cross-section data reveal seizable Coulomb force effects.
30. Measurement of the eta -> pi(+)pi(-)pi(0) Dalitz plot distribution
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, CO. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, M. Hodana, B. Hoistad, N. Husken, A. Jany, BR. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, A. Khoukaz, DA. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, BV. Martemyanov, UG. Meissner, M. Mikirtychiants, HP. Morsch, P. Moskal, H. Ohm, I. Ozerianska, EP. del Rio, NM. Piskunov, et al.
    abstract

    PHYSICAL REVIEW C 90:4 045207 (2014)
    The Dalitz plot distribution of the eta -> pi(+)pi(-)pi(0) decay is determined by using a data sample of 1.2 x 10(7) eta mesons from the pd -> He-3 eta reaction at 1 GeV collected by the WASA detector at COSY.
31. Investigation of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction
    I. Ciepal, B. Klos, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, J. Zejma
    abstract

    The 22nd European Conference on Few-Body Problems in Physics, FEW-BODY SYSTEMS 55:8-10 p. 639-644 (2014)
    Precise and large sets of cross section, vector A (x) , A (y) and tensor A (xx) , A (xy) , A (yy) analyzing power data for the (1) H(d, pp)n breakup reactions were measured at 100 and 130 MeV deuteron beam energies with the SALAD and BINA detectors at KVI and the Germanium Wall setup at FZ-Julich. Results are compared with various theoretical approaches which model the three-nucleon system dynamics. The cross section data reveal a sizable three-nucleon force (3NF) and Coulomb force influence. In case of the analyzing powers very low sensitivity to these effects was found and the data are well describe by 2N models only. For A (xy) at 130 MeV, serious disagreements were observed when 3NF models are included in the calculations.
32. Systematic Study of Three-Nucleon Systems Dynamics in the Cross Section of the Deuteron-Proton Breakup Reaction
    B. Klos, I. Ciepal, B. Jamroz, G. Khatri, S. Kistryn, A. Kozela, A. Magiera, W. Parol, I. Skwira-Chalot, E. Stephan
    abstract

    PROC. FEW-BODY SYSTEMS 55:8-10 p. 721-724 (2014)
    An experiment to investigate the H-1(d, pp)n breakup reaction using a deuteron beam of 340, 380 and 400 MeV and the WASA detector has been performed at the Cooler Synchrotron COSY-Julich. The main goal was the detailed study of various aspects of few-nucleon dynamics in the medium energy region, with particular emphasis on relativistic effects and their interplay with three nucleon forces. These effects become more important with increasing available energy in the three nucleon system. Therefore the investigations at high energies are crucial to understand their nature. The almost 4 pi geometry of the WASA detector gives an unique possibility to study various aspects of dynamics of processes in the three-nucleon reaction. Preliminary results obtained using the WASA detector are presented.
33. Few-Nucleon System Dynamics Studied via Deuteron-Deuteron Breakup Reactions at 160 MeV
    G. Khatri, I. Ciepal, K. Bodek, N. Kalantar-Nayestanaki, S. Kistryn, B. Klos, A. Kozela, A. Magiera, I. Mazumdar, J. Messchendorp, W. Parol, I. Skwira-Chalot, E. Stephan, D. Rozpedzik, A. Wronska, J. Zejma
    abstract

    PROC. FEW-BODY SYSTEMS 55:8-10 p. 1035-1036 (2014)
    An experiment, with the deuteron beams at energy of 160 MeV impinging on the liquid deuterium target, was carried out using the BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-sections for the deuteron break-up reaction. The elastic scattering channel was also measured alongside for the purpose of cross-section normalization.
34. Investigation of three nucleon force effects in deuteron-proton breakup reaction
    W. Parol, I. Ciepal, K. Bodek, S. Kistryn, G. Khatri, A. Magiera, D. Rozpedzik, A. Wronska, J. Zejma, B. Klos, E. Stephan, A. Kozela, P. Kulessa, N. Kalantar-Nayestanaki, J. Messchendorp, I. Mazumdar, I. Skwira-Chalot
    abstract

    PROC. ACTA PHYSICA POLONICA B 45:2 p. 527-532 (2014)
    Experiments devoted to study subtle ingredients of nuclear dynamics were carried out at KVI in Groningen with the use of the H-1(d,pp)n breakup reaction at the deuteron beam energy of 80 MeV/nucleon. The aim of the work is to determine the breakup cross sections and confront them with the set of modern calculations which model forces acting between nucleons. Elastic scattering process was also measured for the purpose of the cross section normalization. This paper presents preliminary results of the data analysis including geometry cross check, energy calibration, particles identification and sample distributions of the unnormalized breakup cross sections.
35. Investigation of three nucleon force effects in deuteron-proton breakup reaction India
    W. Parol, A. Kozela, I. Ciepal, B. Klos, K. Bodek, J. Golak, N. Kalantar-Nayestanaki, G. Khatri, S. Kistryn, P. Kulessa, A. Magiera, I. Mazumdar, J. Messchendorp, D. Rozpedzik, R. Skibiński, I. Skwira-Chalot, E. Stephan, H. Witała, A. Wronska, J. Zejma
    abstract

    EPJ Web of Conf., MESON 2014 - 13TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESONS 81 06007 (2014)
    Experimental study of the deuteron-proton breakup process was perfomed in KVI Groningen. In this paper current status of the collected data analysis is presented, including preliminary results of the cross section for the sample kinematical configuration.
36. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction
    I. Ciepal, B. Klos, E. Stephan, S. Kistryn, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibinski, R. Sworst, J. Urban, H. Witala, J. Zejma
    abstract

    PROC. EPJ Web of Conferences, INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 1 66 UNSP 03019 (2014)
    One of the most important goals of modern nuclear physics is to contruct nuclear force model which properly describes the experimental data. To develop and test predictions of current models the breakup 1H(d(->), pp)n reaction was investigated experimentally at 100 and 130 MeV deuteron beam energies. Rich set of data for cross section, vector and tensor analyzing powers was obtained with the use of the SALAD and BINA detectors at KVI and Germanium Wall setup at FZ-Julich. Results are compared with various theoretical approaches which describe the three-nucleon (3N) system dynamics. For correct description of the cross section data both, three-nucleon force (3NF) and Coulomb force, have to be included into calculations and influence of those ingredients is seizable at specific parts of the phase space. In case of the vector analyzing powers very low sensitivity to any effects beyond nucleon-nucleon interaction was found. At 130 MeV, the A(xy) data are not correctly described when 3NF models are included into calculations.
37. Experimental study of relativistic effects in the dp breakup reaction using the WASA detector
    B. Klos, I. Ciepal, B. Jamroz, G. Khatri, S. Kistryn, A. Kozela, A. Magiera, W. Parol, I. Skwira-Chalot, E. Stephan
    abstract

    PROC. EPJ Web of Conferences, INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 1 66 UNSP 03045 (2014)
    An experiment to investigate the H-1((sic) pp)n breakup reaction at 340 MeV, 360 MeV and 400 MeV deuteron beam energy has been performed at the Cooler Synchrotron COSY-Julich with the WASA detecr. The main goal was to study of various aspects of few-nucleon dynamics in the medium energy region, with a particular emphasis on relativistic effects and their interplay with three nucelon forces. The almost 4 pi geometry of the WASA detector gives an unique possibility to study the different aspects of nucleon-nucleon dynamics in the three nucleon system. The preliminary analysis of the collected data is presented.
38. Experimental Investigation of the Few-Nucleon Dynamics in Deuteron-Deuteron Collision at 160 MeV
    G. Khatri, K. Bodek, I. Ciepal, N. Kalantar-Nayestanaki, S. Kistryn, B. Klos, A. Kozela, A. Magiera, I. Mazumdar, J. Messchendorp, W. Parol, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, A. Wronska, J. Zejma
    abstract

    PROC. EPJ Web of Conferences, MESON 2014 - 13TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESO...
    An experiment, with unpolarized deuteron beam of 160 MeV impinging on liquid deuterium target, was carried out using BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-section for the deuteron break-up reaction. The elastic scattering data were also collected alongside for the purpose of cross-section normalization. We present here a sample of the un-normalised cross-section for the three-body final state (dd -> dpn) reaction.
39. Investigation of three nucleon force effects in deuteron-proton breakup reaction India
    W. Parol, A. Kozela, I. Ciepal, B. Klos, K. Bodek, J. Golak, N. Kalantar-Nayestanaki, G. Khatri, S. Kistryn, P. Kulessa, A. Magiera, I. Mazumdar, J. Messchendorp, D. Rozpedzik, R. Skibinski, I. Skwira-Chalot, E. Stephan, H. Witala, A. Wronska, J. Zejma
    abstract

    PROC. EPJ Web of Conferences, MESON 2014 - 13TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESO...
    Experimental study of the deuteron-proton breakup process was perfomed in KVI Groningen. In this paper current status of the collected data analysis is presented, including preliminary results of the cross section for the sample kinematical configuration.
40. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction
    I. Ciepal, B. Klos, E. Stephan, S. Kistryn, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, J. Zejma
    abstract

    EPJ Web of Conferences, INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 1 66 UNSP 03019 (2014)
    One of the most important goals of modern nuclear physics is to contruct nuclear force model which properly describes the experimental data. To develop and test predictions of current models the breakup 1H(d(->), pp)n reaction was investigated experimentally at 100 and 130 MeV deuteron beam energies. Rich set of data for cross section, vector and tensor analyzing powers was obtained with the use of the SALAD and BINA detectors at KVI and Germanium Wall setup at FZ-Julich. Results are compared with various theoretical approaches which describe the three-nucleon (3N) system dynamics. For correct description of the cross section data both, three-nucleon force (3NF) and Coulomb force, have to be included into calculations and influence of those ingredients is seizable at specific parts of the phase space. In case of the vector analyzing powers very low sensitivity to any effects beyond nucleon-nucleon interaction was found. At 130 MeV, the A(xy) data are not correctly described when 3NF models are included into calculations.
41. Measurement of the pn -> pp pi(0)pi(-) reaction in search for the recently observed resonance structure in d pi(0)pi(0) and d pi(+)pi(-) systems
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, CO. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, A. Jany, BR. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, A. Khoukaz, DA. Kirillov, S. Kistryn, J. Klaja, H. Kleines, B. Klos, M. Krapp, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani, D. Lersch, L. Li, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, HP. Morsch, P. Moskal, BK. Nandi, H. Ohm, I. Ozerianska, EP. del Rio, NM. Piskunov, P. Plucinski, P. Podkopal, et al.
    abstract

    PHYSICAL REVIEW C 88:5 055208 (2013)
    Exclusive measurements of the quasifree pn -> pp pi(0)pi(-) reaction have been performed by means of pd collisions at T-p = 1.2 GeV using the wide angle shower apparatus (WASA) detector setup at the cooler synchrotron COSY (Institut fur Kernphysik, Julich). Total and differential cross sections have been obtained covering the energy region root s = (2.35-2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. NoABCeffect, i.e., low-mass enhancement is found in the pi(0)pi(-) -invariant mass spectrum, in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s wave. At the upper end of the covered energy region t-channel processes for Roper, Delta(1600) and Delta Delta excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at m = 2.37 GeV with Gamma = 70 MeV and I (J(P)) = 0(3(+)) observed recently in pn -> d pi(0)pi(0) and pn -> d pi(+)pi(-) reactions leads to an agreement with the data also at low energies.
42. Search for a dark photon in the pi(0) -> e(+)e(-)gamma decay
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, E. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, CO. Gullstrom, F. Hauensteinn, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, A. Jany, BR. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, DA. Kirillov, B. Klos, M. Krapp, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, L. Li, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, UG. Meissner, M. Mikirtychiants, HP. Morsch, P. Moskal, BK. Nandi, H. Ohm, I. Ozerianska, EP. del Rio, et al.
    abstract

    PHYSICS LETTERS B 726:1-3 p. 187-193 (2013)
    The presently world largest data sample for pi(0) -> gamma e(+)e(-) decays studies containing nearly 5 x 10(5) events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi(0) -> gamma U -> gamma e(+)e(-) decay from the pp -> pp pi(0) reaction was carried out. An upper limit on the square of the U -> gamma mixing strength parameter epsilon(2) of 5 x 10(-6) at 90% CL was obtained for the mass range 20 MeV < M-U < 100 MeV. This result together with other recent experimental limits significantly reduces the M-U vs. epsilon(2) parameter space which could explain the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon. (C) 2013 Elsevier B.V. All rights reserved.
43. Investigations of Few-Nucleon System Dynamics in Medium Energy Domain
    I. Ciepal, B. Klos, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, A. Wronska, J. Zejma
    abstract

    20th International IUPAP Conference on Few-Body Problems in Physics (FB), FEW-BODY SYSTEMS 54:7-10 p. 1301-1305 (2013)
    Precise and large set of cross sections, vector A (x) , A (y) and tensor A (xx) , A (xy) , A (yy) analyzing powers for the (1) H(d, pp)n breakup reactions were measured at 100 and 130 MeV deuteron beam energies with the use of the SALAD and BINA detectors at KVI and Germanium Wall setup at FZ-Julich. Results are compared with various theoretical approaches which model the three-nucleon (3N) system dynamics. The calculations are based on different two-nucleon (2N) potentials which can be combined with models of the three-nucleon force (3NF) and other pieces of the dynamics can also be included like the Coulomb interaction and relativistic effects. The cross sections data reveal seizable 3NF and Coulomb force influence. In case of analyzing powers very low sensitivity to the effects was found and the data are well describe by 2N models only. At 130 MeV for A (xy) serious disagreements appear when 3NF models are included into calculations.
44. Investigation of the dd -> (3)Hen pi(0) reaction with the FZ Julich WASA-at-COSY facility
    P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, FS. Bergmann, M. Berlowski, H. Bhatt, M. Buscher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Fohl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, CO. Gullstrom, C. Hanhart, F. Hauenstein, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, A. Jany, BR. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, FA. Khan, A. Khoukaz, DA. Kirillov, S. Kistryn, J. Klaja, H. Kleines, B. Klos, M. Krapp, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani, D. Lersch, L. Li, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, HP. Morsch, P. Moskal, BK. Nandi, H. Ohm, I. Ozerianska, EP. del Rio, NM. Piskunov, P. Plucinski, et al.
    abstract

    PHYSICAL REVIEW C 88:1 014004 (2013)
    An exclusive measurement of the dd -> (3)Hen pi(0) reaction was carried out at a beam momentum of p(d) = 1.2 GeV/c using the WASA-at-COSY facility. Information on the total cross section as well as differential distributions was obtained. The data are described by a phenomenological approach based on a combination of a quasifree model and a partial wave expansion for the three-body reaction. The total cross section is found to be sigma(tot) = ( 2.89 +/- 0.01(stat) +/- 0.06(sys) +/- 0.29(norm)) mu b. The contribution of the quasifree processes ( with the beam or target neutron being a spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of phase space. The remaining part of the cross section can be described by a partial wave decomposition indicating the significance of p-wave contributions in the final state.
45. Investigation of the dd -> 3henpi0 reaction with the FZ Jülich WASA-at-COSY facility
    P. Adlarson, ..., W. Bardan, I. Ciepał, E. Czerwiński, M. Hodana, J. Klaja, W. Krzemień, I. Ozerianska, P. Moskal, M. Skurzok,M. Zieliński, et al.
    download

    abstract

    Phys. Rev. C 88 (2013) 014004

    HEP: arXiv:1304.3561
    An exclusive measurement of the dd?3Hen?0 reaction was carried out at a beam momentum of pd= 1.2 GeV/c using the WASA-at-COSY facility. Information on the total cross section as well as differential distributions was obtained. The data are described by a phenomenological approach based on a combination of a quasifree model and a partial wave expansion for the three-body reaction. The total cross section is found to be ?tot=(2.89?0.01stat?0.06sys?0.29norm) ?b. The contribution of the quasifree processes (with the beam or target neutron being a spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of phase space. The remaining part of the cross section can be described by a partial wave decomposition indicating the significance of p-wave contributions in the final state.
46. SYSTEMATIC STUDIES OF THE THREE-NUCLEON SYSTEM DYNAMICS IN THE DEUTRON-PROTON BREAKUP REACTION
    B. Klos, I. Ciepal, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, B. Jamroz, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibinski, R. Sworst, J. Urban, H. Witala, A. Wronska, J. Zejma
    abstract

    PROC. ACTA PHYSICA POLONICA B 44:3 p. 345-348 (2013)
    Precise and large sets of data for cross section, vector and tensor analyzing powers for the H-1((d) over right arrow ,pp)n breakup reaction were obtained in experiments carried out at KVI Groningen and FZ-Julich at deuteron beam energies of 100 MeV, 13 MeV and 160 MeV (cross sections only). These precise experimental data obtained in a wide phase-space region allowed to establish evidences for three-nucleon force contributions and to confirm predictions of sizable effect of the Coulomb force. The vector analyzing powers data are generally quite well described by theoretical predictions even with pure nucleon nucleon interactions. Tensor analyzing powers can be also very well reproduced by calculations in most of the studied region but in some regions locally discrepancies are observed at energy of 130 MeV. DOI:10.5506/APhysPolB.44.345
47. SYSTEMATIC STUDIES OF THE THREE-NUCLEON SYSTEM DYNAMICS IN THE DEUTRON-PROTON BREAKUP REACTION
    B. Klos, I. Ciepal, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, B. Jamroz, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, A. Wronska, J. Zejma
    abstract

    47th Zakopane Conference on Nuclear Physics - Extremes of the Nuclear Landscape, ACTA PHYSICA POLONICA B 44:3 p. 345-348 (2013)
    Precise and large sets of data for cross section, vector and tensor analyzing powers for the H-1((d) over right arrow ,pp)n breakup reaction were obtained in experiments carried out at KVI Groningen and FZ-Julich at deuteron beam energies of 100 MeV, 13 MeV and 160 MeV (cross sections only). These precise experimental data obtained in a wide phase-space region allowed to establish evidences for three-nucleon force contributions and to confirm predictions of sizable effect of the Coulomb force. The vector analyzing powers data are generally quite well described by theoretical predictions even with pure nucleon nucleon interactions. Tensor analyzing powers can be also very well reproduced by calculations in most of the studied region but in some regions locally discrepancies are observed at energy of 130 MeV. DOI:10.5506/APhysPolB.44.345
48. Vector analyzing powers of the deuteron-proton elastic scattering and breakup at 100 MeV
    E. Stephan, S. Kistryn, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, M. Eslami-Kalantari, AC. Fonseca, I. Gasparic, J. Golak, L. Joulaeizadeh, N. Kalantar-Nayestanaki, H. Kamada, B. Klos, A. Kozela, JG. Messchendorp, H. Moeini, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, R. Skibiński, R. Sworst, A. Wilczek, H. Witała, J. Zejma
    abstract

    EUROPEAN PHYSICAL JOURNAL A 49:3 36 (2013)
    High-quality vector analyzing power data for the H-1(d,pp)n breakup reaction and elastic scattering at 100 MeV beam energy have been measured in a large part of the phase space for these processes. The results are compared to theoretical predictions obtained using the charge-dependent Bonn potential alone or combined with the three-nucleon force TM99 as well as to the results of calculations in the coupled-channel approach, with or without the inclusion of the Coulomb interaction. In the studied observables, effects of the 3NF and the Coulomb force are almost absent. The pairwise NN interactions alone are sufficient to describe the experimental results.
49. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction
    I. Ciepal, B. Klos, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibinski, R. Sworst, J. Urban, H. Witala, A. Wronska, J. Zejma
    abstract

    PROC. EPJ Web of Conferences, MESON 2012 - 12TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESO...
    Precise and large sets of cross sections for the H-1(d,pp)n and H-2(p,pp)n breakup reactions were measured at 130 deuteron and 190 MeV proton beam energies with the use of detectors which covered almost the full phase space. The results are compared with various theoretical approaches which model the 3N system dynamics. The calculations are based on different 2N potentials which can be combined with models of the three-nucleon force (3NF). The differential cross sections appear to be a very sensitive tool for testing the interaction models and allow to search for various ingredients of the dynamics, not only the 3NF but also the Coulomb interaction and relativistic effects which are relatively new achievements of the theory.
50. Studies of the Three-Nucleon System Dynamics in the Deuteron-Proton Breakup Reaction
    I. Ciepal, B. Klos, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, J. Golak, V. Jha, N. Kalantar-Nayestanaki, H. Kamada, G. Khatri, D. Kirillov, D. Kirillov, S. Kliczewski, A. Kozela, M. Kravcikova, H. Machner, A. Magiera, G. Martinska, J. Messchendorp, A. Nogga, W. Parol, A. Ramazani-Moghaddam-Arani, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, A. Wronska, J. Zejma
    abstract

    EPJ W. of Conf., MESON 2012-12TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESONS 37 UNSP 09011 (2012)
    Precise and large sets of cross sections for the H-1(d,pp)n and H-2(p,pp)n breakup reactions were measured at 130 deuteron and 190 MeV proton beam energies with the use of detectors which covered almost the full phase space. The results are compared with various theoretical approaches which model the 3N system dynamics. The calculations are based on different 2N potentials which can be combined with models of the three-nucleon force (3NF). The differential cross sections appear to be a very sensitive tool for testing the interaction models and allow to search for various ingredients of the dynamics, not only the 3NF but also the Coulomb interaction and relativistic effects which are relatively new achievements of the theory.
51. Vector and Tensor Analyzing Powers in Deuteron-Proton Breakup
    E. Stephan, S. Kistryn, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, M. Eslami-Kalantari, AC. Fonseca, I. Gasparic, J. Golak, B. Jamroz, L. Joulaeizadeh, H. Kamada, M. Kis, B. Klos, A. Kozela, M. Mahjour-Shafiei, H. Mardanpour, J. Messchendorp, A. Micherdzinska, H. Moeini, A. Nogga, A. Ramazani-Moghaddam-Arani, R. Skibiński, R. Sworst, H. Witała, J. Zejma
    abstract

    21st European Conference on Few-Body Problems in Physics, FEW-BODY SYSTEMS 50:1-4 p. 283-285 (2011)
    High precision data for vector and tensor analyzing powers of the (1)H (d(->), pp)nbreakup reaction at 130 and 100 MeV deuteron beam energies have been measured in a large fraction of the phase space. They are compared to the theoretical predictions based on various approaches to describe the three nucleon (3N) system dynamics. Theoretical predictions describe very well the vector analyzing power data, with no need to include any three-nucleon force effects for these observables. Tensor analyzing powers can be also very well reproduced by calculations in most of the studied region, but locally certain discrepancies are observed. At 130 MeV for A (xy) such discrepancies usually appear, or are enhanced, when model 3N forces are included. Predicted effects of 3NFs are much lower at 100 MeV and at this energy equally good consistency between the data and the calculations is obtained with or without 3NFs.
52. THREE-NUCLEON INTERACTION DYNAMICS STUDIED VIA THE DEUTERON-PROTON BREAKUP
    E. Stephan, S. Kistryn, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, M. Eslami-Kalantari, V. Jha, DA. Kirillov, DI. Kirillov, M. Kis, S. Kliczewski, B. Klos, A. Kozela, M. Kravcikova, VM. Kyryanchuk, M. Lesiak, H. Machner, A. Magiera, M. Mahjour-Shafiei, G. Martinska, J. Messchendorp, A. Micherdzinska, N. Piskunov, D. Protic, A. Ramazani, P. Von Rossen, BJ. Roy, H. Sakai, K. Sekiguchi, I. Sitnik, R. Siudak, R. Sworst, J. Urban, J. Zejma, W. Zipper
    abstract

    PROC. INTERNATIONAL JOURNAL OF MODERN PHYSICS A 26:3-4 p. 725-727 (2011)
    Rich sets of high precision cross sections, vector and tensor analyzing powers for the H-1((d) over right arrow, pp)n breakup reaction were measured at 130 and 100 MeV beam energy with the use of detection systems covering large parts of the phase space. The cross section data allowed to establish evidences for three-nucleon force contributions and to confirm predictions of sizable effect of the Coulomb force in the breakup reaction. Analyzing power data are generally quite well described by theoretical predictions even with pure nucleon-nucleon interactions. However, in some regions discrepancies has been observed for tensor analyzing powers at 130 MeV.
53. Vector and tensor analyzing powers in deuteron-proton breakup at 130 MeV
    E. Stephan, S. Kistryn, R. Sworst, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, AC. Fonseca, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, M. Kis, B. Klos, A. Kozela, M. Mahjour-Shafiei, A. Micherdzinska, A. Nogga, R. Skibiński, H. Witała, A. Wronska, J. Zejma, W. Zipper
    abstract

    PHYSICAL REVIEW C 82:1 014003 (2010)
    High-precision data for vector and tensor analyzing powers for the H-1((d) over right arrow, pp)n reaction at a 130-MeV deuteron beam energy have been measured over a large part of the phase space. Theoretical predictions based on various approaches to describe the three nucleon (3N) system reproduce very well the vector analyzing power data and no three-nucleon force effect is observed for these observables. Tensor analyzing powers are also very well reproduced by calculations in almost the whole studied region, but locally certain discrepancies are observed. For A(xy) such discrepancies usually appear, or are enhanced, when model 3N forces, TM99 or Urbana, are included. Problems of all theoretical approaches with describing A(xx) and A(yy) are limited to very small kinematical regions, usually characterized by the lowest energy of the relative motion of the two protons.
54. Vector and tensor analyzing powers in deuteron-proton breakup at 130 MeV
    E. Stephan, S. Kistryn, R. Sworst, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, AC. Fonseca, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, M. Kis, B. Klos, A. Kozela, M. Mahjour-Shafiei, A. Micherdzinska, A. Nogga, R. Skibinski, H. Witala, A. Wronska, J. Zejma, W. Zipper
    abstract

    PHYSICAL REVIEW C 82:1 014003 (2010)
    High-precision data for vector and tensor analyzing powers for the H-1((d) over right arrow, pp)n reaction at a 130-MeV deuteron beam energy have been measured over a large part of the phase space. Theoretical predictions based on various approaches to describe the three nucleon (3N) system reproduce very well the vector analyzing power data and no three-nucleon force effect is observed for these observables. Tensor analyzing powers are also very well reproduced by calculations in almost the whole studied region, but locally certain discrepancies are observed. For A(xy) such discrepancies usually appear, or are enhanced, when model 3N forces, TM99 or Urbana, are included. Problems of all theoretical approaches with describing A(xx) and A(yy) are limited to very small kinematical regions, usually characterized by the lowest energy of the relative motion of the two protons.
55. Precise set of tensor analyzing power T-20 data for the deuteron-proton breakup at 130 MeV
    E. Stephan, S. Kistryn, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, AC. Fonseca, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, M. Kis, B. Klos, A. Kozela, M. Mahjour-Shafiei, A. Micherdzinska, A. Nogga, R. Skibiński, R. Sworst, H. Witała, J. Zejma, W. Zipper
    abstract

    EUROPEAN PHYSICAL JOURNAL A 42:1 p. 13-24 (2009)
    High-precision tensor analyzing power T-20 data of the H-1(d, pp)n reaction at 130 MeV beam energy have been determined for 81 kinematical configurations. They are compared to theoretical predictions based on various approaches to describe the dynamics of the three-nucleon (3N) system. The calculations are performed using modern realistic nucleon-nucleon potentials combined with three-nucleon force (3NF) models or with an effective 3NF resulting from the explicit treatment of the Delta-isobar in coupled-channels (CC) calculations. Alternatively, the framework of chiral perturbation theory is used to generate consistent two-nucleon and three-nucleon potentials at the currently numerically attainable order. Results of the CC calculations with the Delta degrees of freedom and including long-range Coulomb force are also shown. In general all predictions are consistent with each other and describe the experimental T-20 results quite well. In a few configurations small inconsistencies between the data and the results of all approaches are observed. Predicted effects of the 3NF are not big and in most cases do not lead to an improved description of the data. The Coulomb force effects are also small in size and often opposite to the effects of TM99 3NF.
56. THREE-NUCLEON INTERACTION DYNAMICS STUDIED VIA THE DEUTERON-PROTON BREAKUP
    E. Stephan, S. Kistryn, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, W. Glockle, J. Golak, V. Jha, H. Kamada, D. Kirillov, D. Kirillov, M. Kis, S. Kliczewski, B. Klos, A. Kozela, M. Kravcikova, VM. Kyryanchuk, M. Lesiak, H. Machner, A. Magiera, M. Mahjour-Shafiei, G. Martinska, J. Messchendorp, A. Micherdzinska, A. Nogga, N. Piskunov, D. Protic, A. Ramazani, P. Von Rossen, BJ. Roy, H. Sakai, PU. Sauer, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibinski, R. Sworst, J. Urban, H. Witala, J. Zejma, W. Zipper
    abstract

    PROC. INTERNATIONAL JOURNAL OF MODERN PHYSICS A 24:2-3 p. 515-520 (2009)
    A large set of high precision cross sections, vector A(x), A(y) and tensor A(xx), A(xy), A(yy) analyzing powers for the (1)H((d) over right arrow ,pp)n breakup reaction were measured at 130 MeV beam energy with the detection system covering a large part of the phase space. Results are compared with rigorous theoretical calculations employing various models of the three-nucleon system dynamics. The cross section data allowed to establish evidence for three-nucleon force contributions and to confirm predictions of sizable effect of the Coulomb force in the breakup reaction. Analyzing power data are generally quite well described by theoretical predictions even with pure NN interactions. However, in some regions discrepancies has been observed for tensor analyzing powers, only rarely cured by inclusion of the three nucleon force. This indicates incompletness of the present-day treatment of the spin part of three nucleon system dynamics.
57. THREE-NUCLEON INTERACTION DYNAMICS STUDIED VIA THE DEUTERON-PROTON BREAKUP
    E. Stephan, S. Kistryn, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, M. Eslami-Kalantari, AC. Fonseca, W. Glockle, J. Golak, V. Jha, H. Kamada, D. Kirillov, D. Kirillov, M. Kis, S. Kliczewski, B. Klos, A. Kozela, M. Kravcikova, VM. Kyryanchuk, M. Lesiak, H. Machner, A. Magiera, M. Mahjour-Shafiei, G. Martinska, J. Messchendorp, A. Micherdzinska, A. Nogga, N. Piskunov, D. Protic, A. Ramazani, P. Von Rossen, BJ. Roy, H. Sakai, PU. Sauer, K. Sekiguchi, I. Sitnik, R. Siudak, R. Skibiński, R. Sworst, J. Urban, H. Witała, J. Zejma, W. Zipper
    abstract

    Conference MESON 2008, INTERNATIONAL JOURNAL OF MODERN PHYSICS A 24:2-3 p. 515-520 (2009)
    A large set of high precision cross sections, vector A(x), A(y) and tensor A(xx), A(xy), A(yy) analyzing powers for the (1)H((d) over right arrow ,pp)n breakup reaction were measured at 130 MeV beam energy with the detection system covering a large part of the phase space. Results are compared with rigorous theoretical calculations employing various models of the three-nucleon system dynamics. The cross section data allowed to establish evidence for three-nucleon force contributions and to confirm predictions of sizable effect of the Coulomb force in the breakup reaction. Analyzing power data are generally quite well described by theoretical predictions even with pure NN interactions. However, in some regions discrepancies has been observed for tensor analyzing powers, only rarely cured by inclusion of the three nucleon force. This indicates incompletness of the present-day treatment of the spin part of three nucleon system dynamics.
58. Studies of the three-nucleon system dynamics: Cross sections of the deuteron-proton breakup at 130 MeV
    S. Kistryn, E. Stephan, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, AC. Fonseca, W. Glockle, J. Golak, H. Kamada, M. Kis, B. Klos, A. Kozela, A. Nogga, M. Mahjour-Shafiei, A. Micherdzinska, PU. Sauer, R. Skibiński, R. Sworst, H. Witała, J. Zejma, W. Zipper
    abstract

    20th European Conference on Few-Body Problems in Physics, FEW-BODY SYSTEMS 44:1-4 p. 11-13 (2008)
    The three-nucleon system is the simplest non-trivial testing ground in which the quality of modern nucleon-nucleon interaction models, as well as additional dynamical ingredients referred to as three-nucleon forces, can be probed quantitatively by means of a rigorous technique of solving the Faddeev equations. A large set of high precision, exclusive cross-section data for the (1)H((d) over right arrow, pp)n breakup reaction at 130 MeV was obtained at KVI, Groningen. It allowed to establish for the first time a clear evidence of the three-nucleon force contributions to the cross sections of the breakup process and to confirm recent predictions of sizable influences of the Coulomb force in this reaction.
59. Influence of three-nucleon force effects on polarization observables of the H-1((d)over-bar,pp)n breakup reaction at 130 mev
    R. Sworst, S. Kistryn, E. Stephan, A. Biegun, K. Bodek, I. Ciepal, E. Epelbaum, W. Gloeckle, J. Golak, N. Kalantar-Nayastenaki, H. Kamada, B. Klos, A. Kozela, A. Nogga, R. Skibiński, H. Witała, J. Zejma, W. Zipper
    abstract

    30th Mazurian Lakes Conference on Physics, ACTA PHYSICA POLONICA B 39:2 p. 401-404 (2008)
    High-precision vector and tensor breakup analyzing powers for the reaction H-1((d) over bar ,pp)n at 130 MeV were evaluated for a large phase space region. Results are compared with rigorous theoretical calculations based on realistic nucleon-nucleon potentials as well as on chiral perturbation theory approach. Theoretical predictions generally describe data quite well, only in a few cases influence of three-nucleon forces is significant.
60. Vector and tensor analyzing powers of elastic deuteron-proton scattering at 130 MeV deuteron beam energy
    E. Stephan, S. Kistryn, R. Sworst, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, A. Fonseca, W. Glockle, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, M. Kis, A. Kozela, M. Mahjour-Shafiei, A. Micherdzinska, A. Nogga, PU. Sauer, R. Skibiński, H. Witała, J. Zejma, W. Zipper
    abstract

    PHYSICAL REVIEW C 76:5 057001 (2007)
    High precision vector and tensor analyzing power data of the deuteron-proton elastic scattering at 130 MeV deuteron beam energy have been measured in a large range of angles. They are compared with theoretical predictions obtained in various approaches: with realistic potentials for pure NN interactions, with the inclusion of a three-nucleon force, and in the framework of chiral perturbation theory. All the theoretical calculations describe roughly the main features of the measured distributions, but none of them can reproduce all their details. This indicates the need for further development of the three-nucleon force models.
61. Cross sections of the deuteron-proton breakup as a probe of three-nucleon system dynamics
    S. Kistryn, E. Stephan, N. Kalantar-Nayestanaki, A. Biegun, B. Klos, Z. Sworst, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, AC. Fonseca, W. Gloeckle, J. Golak, H. Kamada, M. Ki, A. Kozela, M. Mahjour-Shafiei, A. Micherdzinska, A. Nogga, PU. Sauer, R. Skibiński, H. Witała, J. Zejma, W. Zipper
    abstract

    International Symposium on New Facet of Three Nucleon Force - 50 Years of Fujita-Miyazawa Three Nucleon Force (FM 50), AIP Confe
    The three-nucleon system is the simplest, non-trivial testing ground which allows one to probe quantitatively modern nucleon-nucleon interaction models. The rigorous technique of solving the Faddeev equations for the three-nucleon system allows one to test the influence of additional dynamical ingredients, referred to as three-nucleon forces, as well as the Coulomb interaction and relativistic effects. A large set of high precision, exclusive cross-section data for the H-1(d,pp)n breakup reaction at 130 MeV was obtained at KVI, Groningen. This allowed us to establish for the first time clear evidence for three-nucleon force contributions to the cross sections of the breakup process and to confirm recent predictions of a sizable influence of the Coulomb force in this reaction.
62. A large, precise set of polarization observables for deuteron-proton breakup at 130 MeV
    E. Stephan, S. Kistryn, N. Kalantar-Nayestanaki, A. Biegun, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaun, AC. Fonseca, W. Gloeckle, J. Golak, H. Kamada, M. Kis, B. Klos, A. Kozela, M. Malljour-Shafiei, A. Micherdzinska, A. Nogga, PU. Sauer, R. Skibiński, R. Sworst, H. Witała, J. Zejma, W. Zipper
    abstract

    International Symposium on New Facet of Three Nucleon Force - 50 Years of Fujita-Miyazawa Three Nucleon Force (FM 50), AIP Confe
    High precision vector A(x), A(y) and tensor A(xx), A(xy), A(yy) analyzing powers for the H-1((d) over right arrow, pp)n breakup reaction were measured at 130 MeV beam energy with the detection system covering a large part of the phase space. Results are compared with rigorous theoretical calculations based on realistic nucleon-nucleon potentials, also with a so-called three-nucleon force included, as well as on chiral perturbation theory. Theoretical predictions generally describe the data quite well, but in some regions discrepancies have been observed, which indicate incompleteness of the present-day treatment of three nucleon dynamics.
63. Three-nucleon force effects in the analyzing powers of the (d)over-right-arrowp breakup at 130 MeV
    A. Biegun, E. Stephan, S. Kistryn, K. Bodek, I. Ciepal, A. Deltuva, E. Epelbaum, W. Glockle, J. Golak, N. Kalantar-Nayestanaki, H. Kamada, M. Kis, B. Klos, A. Kozela, J. Kuros-Zolnierczuk, M. Mahjour-Shafiei, UG. Meissner, A. Micherdzinska, A. Nogga, PU. Sauer, R. Skibiński, R. Sworst, H. Witała, J. Zejma, W. Zipper
    abstract

    29th Mazurian Lakes Conference on Physics, ACTA PHYSICA POLONICA B 37:1 p. 213-218 (2006)
    A measurement of the analyzing powers for the H-1((d) over right arrow pp)n breakup reaction at 130 MeV polarized deuteron beam energy was carried out at KVI Groningen. The experimental setup covered a large fraction of the phase space. Obtained tensor analyzing powers T-22 for selected kinematical configurations have been compared to theoretical predictions based on various approaches: the rigorous Faddeev calculations using the realistic nucleon-nucleon potentials with and without three nucleon force (3NF) models, predictions of the chiral perturbation theory, and coupled channel calculations with the explicit Delta degrees of freedom. In the presented configurations the results of all predictions are very close to one another and there are no significant 3NF influences. Not all of the data can be satisfactory reproduced by the theoretical calculations.

1. Investigation of the Mechanism of Proton Induced Spallation Reactions
   U. Singh, I. Ciepał, B. Kamys, P. Lasko, J. Łukasik, A. Magiera, P. Pawłowski, K. Pysz, Z. Rudy, S.K. Sharma
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   published in: Springer Proc.Phys. 225 (2019) 243-244
   The mechanism of proton-nucleus interactions at GeV energies is still not well understood. The agreement between data and model predictions deteriorates with increasing ejectile energy and for the forward angles. This indicates the presence of preequilibrium processes which are not taken into consideration by present theoretical models. New experimental data are needed to put constraints to any new model of the reaction mechanism. The measurements are planned to be done to study proton-induced reactions at energies in the range from 70 to 230 MeV.