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**Recent Experimental Results on the Low-energy K- Interaction with Nucleons by AMADEUS***R. Del Grande, M. Bazzi, A.M. Bragadireanu, D. Bosnar, M. Cargnelli, C. Curceanu, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R.S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, K. Piscicchia, A. Ramos, A. Scordo, M. Silarski, D.L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*Recent results obtained by the AMADEUS Collaboration on the experimental investigation of the K- low-energy interaction with light nuclei are summarised. The step 0 of AMADEUS consists in the analysis of the data collected at the DAFNE collider with the KLOE detector during the 2004/2005 data taking campaign. The low momentum K- particles (pK circ 127 MeV/c) are absorbed in the light nuclei contained in the detector setup (H, 4He, 9Be and 12C) and hyperon-pion/hyperon-nucleons, emitted in the final state, are reconstructed. From the study of Lambda pi- and Lambda p correlated production, important information on the KN strong interaction in the non-perturbative QCD regime are extracted.**K- multi-nucleon absorption cross sections and branching ratios in Lambda p and Sigma0 p final states***R. Del Grande, K. Piscicchia, O. Vazquez Doce, M. Cargnelli, C. Curceanu, L. Fabbietti, J. Marton, P. Moskal, A. Ramos, A. Scordo, D. L. Sirghi, M. Skurzok, S. Wycech, J. Zmeskal, E. Czerwiński, V. De Leo, P. Fermani, G. Mandaglio, M. Martini, N. Raha, A. Selce, M. Silarski*The determination of low-energy cross sections and branching ratios of the K- multi-nucleon absorption processes in Lambda p and Sigma0 p final states performed by the AMADEUS collaboration is presented. Low momentum K- (pK- ~127 MeV/c) produced at the DAFNE collider are impinged on a Carbon target within the KLOE detector and the two and three nucleon absorption processes are disentangled by comparing the experimental data to phenomenological calculations. The Lambda p spectra entirely interpreted in terms of K- multi-nucleon absorption processes; the possible contribution of a K-pp bound state is demonstrated to overlap with the two nucleon capture process, its absolute yield thus resulting indistinguishable.**First measurement of the K-n->Lambda pi- non-resonant transition amplitude below threshold***K. Piscicchia, S. Wycech, L. Fabbietti, M. Cargnelli, C. Curceanu, R. Del Grande, J. Marton, P. Moskal, A. Scordo, M. Silarski, D. Sirghi, M. Skurzok, I. Tucakovic, O. Vazquez Doce, J. Zmeskal, P. Branchini, E. Czerwinski, V. De Leo, E. De Lucia, A. Di Cicco, P. Fermani, S. Fiore, W. Krzemien, G. Mandaglio, M. Martini, E. Perez del Rio , A. Selce*We present the analysis of K- absorption processes on 4He leading to Lambda pi- final states, measured with the KLOE e+e- spectrometer at the DAFNE collider and extract, for the first time, the modulus of the non-resonant K-n->Lambda pi- direct production amplitude about 33 MeV below the KbarN threshold. This analysis also allows to disentangle the K- nuclear absorption at-rest from the in-flight capture, for K- momenta of about 120 MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K-n->Lambda pi- amplitude for K- absorption at-rest is found to be |A_K-n->Lambda pi-| = (0.334+-0.018(stat.)+0.034 -0.058 (syst.)) fm.**Search for Deeply Bound Kaonic Nuclear States in AMADEUS experiment***M. Skurzok, M. Cargnelli, C. Curceanu, R. Del Grande, L. Fabbietti, C. Guaraldo, J. Marton, P. Moskal, K. Piscicchia, A. Scordo, M. Silarski, D. L. Sirghi, I. Tucakovic, O. Vazquez Doce, S. Wycech, E. Widmann, J. Zmeskal*We briefly report on the search for Deeply Bound Kaonic Nuclear States with AMADEUS in the Sigma0 p channel and future perspectives.**Low-energy Kaon-Nuclei Interaction Studies at DAFNE: SIDDHARTA-2 and AMADEUS***C. Curceanu, A. Amirkhani, M. Bazzi, G. Bellotti, C. Berucci, D. Bosnar, A.M. Bragadireanu, M. Cargnelli, A. Dawood Butt, R. Del Grande, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R.S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, D. Pietreanu, K. Piscicchia, A. Scordo, H. Shi, M. Silarski, D. Sirghi, F. Sirghi, M. Skurzok, H. Tatsuno, O. Vazquez Doce, E. Widmann, J. Zmeskal*The DAFNE electron?positron collider of the Laboratori Nazionali di Frascati of INFN has made available a unique quality low-energy negatively charged kaons ?beam?, which is being used to study the kaon?nucleon/nuclei interactions by the SIDDHARTA-2 experiment and the AMADEUS Collaboration. The dynamics of the strong interaction processes in the non-perturbative regime is approached by lattice calculations and effective field theories (ChPT) which are still lacking experimental results in the low-energy regime, fundamental for their good understanding. The studies of kaonic atoms and of the kaonic nuclear processes performed by SIDDHARTA-2 and AMADEUS play in this context a key-role.**Low-energy Antikaon-Nucleon/Nuclei Interaction Studies by AMADEUS***K. Piscicchia, M. Cargnelli, C. Curceanu, R. Del Grande, L. Fabbietti, C. Guaraldo, J. Marton, P. Moskal, A. Scordo, M. Silarski, D. Sirghi, M. Skurzok, I. Tucakovic, O. Vazquez Doce, S. Wycech, E. Widmann, J. Zmeskal*The AMADEUS experiment deals with the investigation of the low-energy kaon?nuclei hadronic interaction at the DA?NE collider at LNF-INFN, which is fundamental to solve longstanding questions in the non-perturbative strangeness QCD sector. AMADEUS step 0 consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K- absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopy study with very low-momentum (100 MeV) in-flight K? captures. With AMADEUS step 1, a dedicated pure carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K? nuclear interaction. The results obtained in the analyses of the hyperon?pion correlated events, searching for the resonant shapes of Y states, will be described.**K- absorption on two nucleons and ppK- bound state search in the E0p final state***O. Vazquez Doce, L. Fabbietti, M. Cargnelli, C. Curceanu, J. Marton, K. Piscicchia, A. Scordo, D. Sirghi, I. Tucakovic, S. Wycech, J. Zmeskal, A. Anastasi, F. Curciarello, E. Czerwinski, W. Krzemien, G. Mandaglio, M. Martini, P. Moskal, V. Patera, E. Perez del Rio, M. Silarski*We report the measurement of K- absorption processes in the Sigma_0p final state and the first exclusive measurement of the two nucleon absorption (2NA) with the KLOE detector. The 2NA process without further interactions is found to be 12% of the sum of all other contributing processes, including absorption on three and more nucleons or 2NA followed by final state interactions with the residual nucleons. We also determine the possible contribution of the ppK- bound state to the ?0p final state. A yield of ppK-/K_stop is found to be (0.044+/-0.009stat+0.004+/-0.005syst)?10?2 but its statistical significance based on an F-test is only 1sigma.**Investigation of the low energy kaons hadronic interactions in light nuclei by AMADEUS***K. Piscicchia, ... ,P.Moskal, ...,M. Silarski, M. Skurzok, ..., et al.*The AMADEUS experiment aims to provide unique quality data for K- interaction with nucleons and light nuclei, both at-rest and in-flight (for K- momenta of about 100 MeV). The goal is to solve longstanding open issues in the non-perturbative QCD in the strangeness sector, like the nature of the Lambda(1405) state, the resonant versus non-resonant yield in nuclear K- capture and the properties of kaonic nuclear clusters which are strongly related to the multi-nucleon absorption processes. We can take advantage of the DAFNE collider representing a unique source of monochromatic low-momentum kaons, whose nuclear interaction with the materials of the KLOE detector (used as an active target) furnish us excellent acceptance and resolution data for K- capture on H,4He,9Be and12C, both at-rest and in-flight. AMADEUS step 0 consisted in the analysis of the 2004-2005 KLOE data. A second step consisted in the implementation in the central region of the KLOE detector of a pure graphite target, providing a high statistic sample of K^{?}^{12} C nuclear captures at rest. For the future, new setups for various dedicated targets are under preparation.**Unprecedented Studies of the Low-energy Negatively Charged Kaons Interactions in Nuclear Matter by AMADEUS***C. Curceanu, K. Piscicchia, M. Bazzi, C. Berucci, D. Bosnar, A.M. Bragadireanu, A. Clozza, M. Cargnelli, A. D'Uffizi, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, M. Iliescu, P. Levi Sandri, J. Marton, D. Pietreanu, M. Poli Lener, R. Quaglia, A. Romero Vidal, E. Sbardella, A. Scordo, H. Shi, D. Sirghi, F. Sirghi, M. Skurzok, I. Tucakovic, O. Vazquez Doce, E. Widmann, J. Zmeskal*The AMADEUS experiment aims to provide unique quality data of K? hadronic interactions in light nuclear targets, in order to solve fundamental open questions in the non-perturbative strangeness QCD sector, like the controversial nature of the ?(1405) state, the yield of hyperon formation below threshold, the yield and shape of multi-nucleon K? absorption, processes which are intimately connected to the possible existence of exotic antikaon multi-nucleon clusters. AMADEUS takes advantage of the DA?NE collider, which provides a unique source of monochromatic low-momentum kaons and exploits the KLOE detector as an active target, in order to obtain excellent acceptance and resolution data for K? nuclear capture on H, 4He, 9Be and 12C, both at-rest and in-flight. During the second half of 2012, a successful data taking was performed with a dedicated pure carbon target implemented in the central region of KLOE, providing a high statistic sample of pure at-rest K? nuclear interactions. For the future, dedicated setups involving cryogenic gaseous targets are under preparation.

**Total branching ratio of the K- two-nucleon absorption in 12C***R. Del Grande, K. Piscicchia, M. Cargnelli, C. Curceanu, L. Fabbietti, J. Marton, P. Moskal, A. Ramos, A. Scordo, D. Sirghi, M. Skurzok, O.Vazquez Doce, S. Wycech, J. Zmeskal, V. De Leo, G. Mandaglio, M. Martini, E.Perez Del Rio, A. Selce, M. Silarski*This work is a critical re-analysis of the results obtained by the AMADEUS collaboration, concerning the measurement of the K? multi-nucleon absorption reactions, on a 12C target, in the Lambda-p final state (Del Grande et al 2019 Eur. Phys. J. C 79, 190). We show that a good estimate of the K? two-nucleon absorption total branching ratio can be extracted, given that the measured final state interactions and conversion reactions contain information on almost all the remaining hyperon-nucleon final state combinations. The main contribution to the total branching ratio of the K? two-nucleon absorption in Carbon is extracted from the measured ratios and is found to be (16.1 +- 2.9(stat) +4.3 -5.5(syst) ) %, which is in agreement with recent theoretical predictions. The missing contribution, from those few channels for which a Lambda-p pair could not be detected in the final state of the interaction, is also estimated combining both the measured branching ratios and the available theoretical information and amounts to (5.5 +- 0.1(stat) +1.0 -0.9(syst) ) %. Altogether the total branching ratio of the K? two-nucleon absorption in Carbon is found to be (21.6 +- 2.9(stat) +4.4 -5.6(syst) ) %.**Studies of low-energy K- hadronic interactions with light nuclei by AMADEUS***R. Del Grande, M. Bazzi, A. M. Bragadireanu, D. Bosnar, M. Cargnelli, A. Clozza, C. Curceanu, L. De Paolis, L. Fabbietti, F. Ghio, C. Guaraldo, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, K. Piscicchia, A. Ramos, A. Scordo, M. Silarski, D .L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech and J. Zmeskal*The AMADEUS collaboration aims to provide precise experimental information on the K- strong interaction with nucleons in the low-energy regime. The step 0 of AMADEUS consists of the re-analysis of the data collected with the KLOE detector at the DA?NE collider during the 2004/2005 data taking campaign. The absorptions of low-momentum K?s in the nuclei contained in the detector and the beam pipe setup (H,4He,9Be and12C) are investigated. Information on the K- single and multi-nucleon interactions are extracted from the study of the Lambda-pi- and p correlated production in the final state.**Low-Energy K- Nucleon/Multi-nucleon Interaction Studies by AMADEUS***M. Skurzok, M. Bazzi, G. Bellotti, A. M. Bragadireanu, D. Bosnar, A. Butt, M. Cargnelli, C. Curceanu, L. De Paolis, R. Del Grande, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, D. Pietreanu, K. Piscicchia, A. Ramos, A. Scordo, H. Shi, M. Silarski, D. L. Sirghi, F. Sirghi, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The AMADEUS collaboration aims to provide new experimental constraints to the K- N strong interaction in the regime of non-perturbative QCD, exploiting low-energy K- hadronic interactions with light nuclei (e.g. H, 4 He, 9 Be and 12 C). The low-momentum kaons ( p K -- 127 MeV/c) produced at the DAFNE collider are ideal to explore both stopped and in-flight K- nuclear captures. The KLOE detector is used as an active target, allowing to achieve excellent acceptance and resolutions for the data. In this work the results obtained from the study of Lambda pi- and Lambda p correlated production in the final state are presented.**Low-energy K- Hadronic Interactions with Light Nuclei by AMADEUS***M. Skurzok, M. Bazzi, G. Bellotti, A. M. Bragadireanu, D. Bosnar, M. Cargnelli, C. Curceanu, L. De Paolis, R. Del Grande, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, D. Pietreanu, K. Piscicchia, A. Ramos, A. Scordo, H. Shi, M. Silarski, D. L. Sirghi, F. Sirghi, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The AMADEUS collaboration aims to provide new experimental constraints to the K- N strong inter- action in the regime of non-perturbative QCD, exploiting low-energy K- hadronic interactions with light nuclei (e.g. H, 4He, 9Be and 12C). The low-momentum kaons (pK ~127 MeV/c) produced at the DAFNE collider are ideal to explore both stopped and in-flight K- nuclear captures. The KLOE detector is used as an active target, allowing to achieve excellent acceptance and resolutions for the data. In this work the results obtained from the study of Lambda pi- and Lambda p correlated production in the final state are presented.**Low energy antikaon-nucleon/nuclei interaction studies by AMADEUS***K. Piscicchia, M. Bazzi, G. Belloti, A. M. Bragadireanu, D. Bosnar, A. D. Butt, M. Cargnelli, C. Curceanu, R. Del Grande, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, A. Ramos, A. Scordo, M. Silarski, D. L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The AMADEUS experiment at the DAFNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K-interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K-absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K- captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K- nuclear interaction. The first measurement of the non-resonant transition amplitude |A K- n->Lambda pi- | at sqrt(s)=33 MeV below the K?N threshold is presented, in relation with the Lambda(1405) properties studies. The analysis procedure adopted in the search for K-multi-nucleon absorption cross sections and Branching Ratios will be also described.**Low Energy Antikaon-nucleon/nuclei interaction studies by AMADEUS***K. Piscicchia, M. Bazzi, G. Belloti, A. M. Bragadireanu, D. Bosnar, A. D. Butt, M. Cargnelli, C. Curceanu, R. Del Grande, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, A. Ramos, A. Scordo, M. Silarski, D. L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech and J. Zmeskal*The AMADEUS experiment at the DAFNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K- interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K- absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K- captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K- nuclear interaction. The first measurement of the non-resonant transition amplitude at below the K?N threshold is presented, in relation with the Lambda(1405) properties studies. The analysis procedure adopted in the serarch for K- multi-nucleon absorption cross sections and Branching Ratios will be also described.**Lambdap correlated production from low energy K- 12C interactions by AMADEUS***R. Del Grande, M. Bazzi, G. Belloti, A. M. Bragadireanu, D. Bosnar, A. D. Butt, M. Cargnelli, C. Curceanu, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, D. Pietreanu, K. Piscicchia, A. Ramos, A. Scordo, H. Shi, M. Silarski, D. L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech and J. Zmeskal*The main steps for the analysis of the Lambdap correlated production in low-energy K- captures on Carbon nuclei, performed by the AMADEUS collaboration, are presented. The goal is to perform the first comprehensive study of the K- absorption on two, three and four nucleons, exploiting the lowmomentum K-s (pK ~ 127 MeV/c) produced at the DAFNE collider, and to measure the low-energy cross sections and branching ratios of the K- multinucleon absorption processes in both the Lambdap and Sigma0p channels. An integrated luminosity of 1.74 fb-1 collected during the KLOE 2004/2005 data campaign is analysed by reconstructing the Lambdap final state.**Low Energy Antikaon-Nucleon/Nuclei Interaction Studies by AMADEUS***K. Piscicchia, M. Cargnelli, C. Curceanu, R. Del Grande, L. Fabbietti, C. Guaraldo, J. Marton, P. Moskal, A. Scordo, M. Silarski, D. L. Sirghi, M. Skurzok, I. Tucakovic, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The AMADEUS experiment at the DAFNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K- interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K- absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K- captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K- nuclear interaction. The first measurement of the non-resonant transition amplitude |AK-n->Lambda pi-| at ?s = 33 MeV below the KN threshold is presented, in relation with the Lambda(1405) properties studies.**Studies of low-energy K- nuclear interactions by AMADEUS***R. Del Grande, M. Bazzi, G. Belloti, A. M. Bragadireanu, D. Bosnar, A. D. Butt, M. Cargnelli, C. Curceanu, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. S. Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, D. Pietreanu, K. Piscicchia, A. Scordo, H. Shi, M. Silarski, D. L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone,O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The goal of the AMADEUS experiment is to shed light on unsolved fundamental issues in the non-perturbative strangeness QCD sector through the study of lowenergy K- hadronic interactions with light nuclear targets. The main open questions are the controversial nature of the Delta(1405) state, which is investigated in hyperon-pion correlation studies, and the possible existence of exotic antikaon multi-nucleon clusters, whose search in K- induced reactions is intimately related to the studies of the K- multi-nucleon absorption processes in hyperon-nucleon/nucleus channels. The DAFNE collider at the INFN-LNF provides unique monochromatic low-momentum kaons from the ? meson decay almost at-rest, suitable for the AMADEUS studies. The KLOE detector is exploited as an active target, in order to obtain excellent acceptance and resolution data for K- nuclear capture on H, 4He, 9Be and 12C, both at-rest and in-flight.**Low energy interaction studies of negative kaons in light nuclear targets by AMADEUS***K. Piscicchia, M. Bazzi, G. Belotti, A. M. Bragadireanu, D. Bosnar, A. D. Butt, M. Cargnelli, C. Curceanu, R. Del Grande, L. De Paolis, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. S Hayano, M. Iliescu, M. Iwasaki, P. Levi Sandri, J. Marton, M. Miliucci, P. Moskal, S. Okada, D. Pietreanu, A. Scordo, M. Silarski, D. L. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, O. Vazquez Doce, E. Widmann, S. Wycech, J. Zmeskal*The AMADEUS collaboration is performing experimental investigations in the sector of the low energy strangeness hadron physics by taking advantage of the DAFNE collider, which provides a unique source of monochromatic low-momentum kaons and exploiting the KLOE detector as an active target. The K- single and multi-nuclear absorption on H, 4He, 9Be and 12C, both at-rest and in-flight, are studied with the aim to determine the nature of the controversial Lambda(1405), the non-resonant hyperon pion formation amplitude below the K?N threshold, the yield and cross sections of K- multi-nucleon absorptions intimately connected to the antikaon multi-nucleon clusters properties and the K- scattering cross sections on light nuclear targets. These studies have a strong impact on the non-perturbative strangeness QCD with implications ranging from nuclear physics to the equation of state of neutron stars.**Low-energy antikaon-nuclei interactions studies by AMADEUS: from QCD with strangeness to neutron stars***K. Piscicchia,..., R. Del Grande, ..., P. Moskal*The AMADEUS collaboration aims to provide unique quality results from K- hadronic interactions in light nuclear targets, in order to solve fundamental open questions in the non-perturbative strangeness QCD sector, like the controversial nature of the Lambda(1405) state, the yield of hyperon formation below threshold, the yield and shape of multi-nucleon K- absorption, processes which are intimately connected to the possible existence of exotic antikaon multi-nucleon clusters and to the role of strangeness in neutron stars. AMADEUS takes advantage of the DAFNE collider, which provides a unique source of monochromatic low-momentum kaons and exploits the KLOE detector as an active target, in order to obtain excellent acceptance and resolution data for K- nuclear capture on H, 4He, 9Be and 12C, both at-rest and in-flight.**Search for Deeply Bound Kaonic Nuclear States with AMADEUS***M. Skurzok, M. Cargnelli, C. Curceanu, R. Del Grande, L. Fabbietti, C. Guaraldo, J. Marton, P. Moskal, K. Piscicchia, A. Scordo, M. Silarski, D. L. Sirghi, I. Tucakovic, O. Vazquez Doce, S. Wycech, E. Widmann, J. Zmeskal*We briefly report on the search for Deeply Bound Kaonic Nuclear States with AMADEUS in the Sigma0p channel following K- absorption on 12C and outline future perspectives for this work.**Low-energy Antikaon-Nucleon Absorption Studies by AMADEUS***K. Piscicchia,..., R. Del Grande, ..., P. Moskal, ..., M. Silarski, ..., M. Skurzok, ...*The AMADEUS experiment investigates the low-energy kaon?nuclei hadronic interaction at the DA?NE collider at LNF-INFN. In particular, the study of hyperon resonances formation, following K--induced reactions in light nuclear targets, will be presented. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K- absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K- captures. With AMADEUS step 1, a dedicated pure carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K nuclear interaction. The results obtained in the analyses of the hyperon?pion correlated events, searching for the resonant shapes of Y* states, will be described.**Investigating the low-energy K- interactions in nuclear matter with AMADEUS***R. Del Grande, ...., P. Moskal, et al. (AMADEUS Collaboration)*The AMADEUS collaboration studies low-energy K- interactions with light nuclei in order to clarify some aspects related to the behaviour of hadrons containing strangeness in nuclear medium. One of the main topics is the quest about the possible formation of Kaonic Nuclear Clusters (KNC), which depends on the strength of the anti-kaons interaction with nucleons. In kaonic absorption experiments, the search for KNC is strictly connected with the measurement of the yields of the so-called multi-nucleon absorption processes. In this paper, the study of Sigma0p correlated production from K? absorption in 12C, using the KLOE 2004-2005 data set, is reported. The yield of the two nucleon absorption (2NA), when the produced Sigma0 and p particles are free from any final state interaction process, was measured for the first time. The contribution of a ppK- bound state was also tested. The best fit is obtained for a ppK? state with a binding energy of 45 MeV and a width of 30 MeV, but the statistical significance is at the level of 1? only.**Antikaon Interactions with Nucleons and Nuclei - AMADEUS At Dafne***J. Marton, ..., P. Moskal, ..., M. Skurzok*The aim of AMADEUS is to provide unprecedented experimental information on K- absorption in light nuclear targets, to face major open problems in hadron nuclear physics in the strangeness sector, namely the nature of the L(1405), strongly related to the possible existence of kaonic nuclear clusters, kaons and hyperon scattering cross sections on nucleons and nuclei. These issues are fundamental for a better understanding of the non-perturbative QCD in the strangeness sector. AMADEUS step 0 deals with the analysis of the 2004-2005 KLOE collected data. The interactions of the negative kaons produced by the DAFNE collider (a unique source of monochromatic low-momentum kaons) with the materials of the KLOE detector, used as active targets, provide samples of K- absorptions on H, 4He, 9Be and 12C, both at-rest and in-flight. A second step deals with the data from the implementation in the central region of the KLOE detector of a pure graphite target, providing a high statistic sample of K- 12C nuclear captures at rest. For the future a new setup, with various dedicated gaseous and solid targets, is under preparation.**Experimental results on multi-nucleonic K- absorptions in light nuclei***O. Vazques Doce, ..., E. Czerwinski, ..., W. Krzemien, ..., P. Moskal, ..., M. Silarski, et al. (AMADEUS Collaboration)***K- multi-nucleon absorption processes in hadronic interaction studies***R. Del Grande, ..., E. Czerwinski, ..., W. Krzemien, ..., P. Moskal, ..., M. Silarski, et al. (AMADEUS Collaboration)*The AMADEUS collaboration aims to afford unprecedented informations on the K- low-energy interactions with light nuclei, thanks to the unique monochromatic low-momentum kaons pro- vided by the DAFNE collider and the excellent acceptance and resolution of the KLOE detector, used as an active target. We will report on the measurement of the yield of the K ? two nucleon absorption process, obtained by studying Sigma0 p pairs produced in the final state of the K-12C ab- sorptions. Further, the possible contribution of a ppK- bound state was investigated. The best fit corresponding to a gives space to a yield of ppK-/K- stop = (0.044 ? 0.009 stat +0.004 ?0.005 syst) ×10 binding energy and a width of 45 and 30 MeV/c 2 , respectively. A statistical analysis of this result shows although that its significance is only at the level of 1sigma.**Investigation of the low-energy kaons hadronic interactions in light nuclei by AMADEUS***A. Scordo, ..., P. Moskal, et all.*The AMADEUS experiment deals with the investigation of the low-energy kaon-nuclei hadronic interaction at the DAFNE collider at LNF-INFN. This study is fundamental to solve longstanding questions concerning interactions of strange quarks in the non-perturbative QCD. AMADEUS step 0 consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K? absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopy study with very low momentum (100 MeV/c) in-flight K? captures. In this paper, we present an overview of the analysis strategy, with particular emphasis on the results obtained in the analyses of the events with correlated Sigma0 and p.

**K- nucleon/multi-nucleon interaction studies by AMADEUS towards clarifying the existence of kaonic nuclear states***Magdalena Skurzok fo AMADEUS Collaboration*presented at: FB22 XXII International Conference on Few-Body Problems in Physics, Caen, France, July 9 - 13, 2018**Search for Deeply Bound Kaonic Nuclear States in AMADEUS experiment***M. Skurzok*presented at: Nuclear Physics in Astrophysics VIII, 18-23 June 2017, Catania - Laboratori Nazionali del Sud