International Conference on Exotic Atoms and Related Topics - EXA2014

K- and eta nuclei J. Mares, A. Cieply, D. Gazda Nuclear Physics Institute, 250 68 Rez, Czech Republic E. Friedman, A. Gal Racah Institute, The Hebrew University, 91 904 Jerusalem, Israel This contribution reports on our recent calculations of K- and eta quasi-bound states in nuclear systems using subthreshold energy dependent Kbar-N and eta-N amplitudes [1-4]. Many-body K- nuclear systems were calculated within a chirally motivated meson-baryon coupled-channel model due to Cieply and Smejkal [5]. Self-consistent evaluations yield K- potential depths -Re$V_K$ of order 100 MeV. Dynamical polarization effects and two-nucleon absorption modes are discussed. The widths of all K- nuclear quasi-bound states are comparable or even larger than the corresponding binding energies, exceeding considerably the energy level spacing [2]. The strong energy dependence of the s-wave eta-N scattering amplitude was included self consistently in eta nuclear bound state calculations within several underlying eta-N models. Binding energies and widths of eta nuclear states were calculated for nuclei across the periodic table [3,4], including 25Mg for which some evidence was proposed in a COSY experiment [6]. [1] A. Cieply, E. Friedman, A. Gal, D. Gazda, J. Mares, Phys. Lett. B 702 (2011) 402; Phys. Rev. C 84 (2011) 045206. [2] D. Gazda, J. Mares, Nucl. Phys. A 881 (2012) 159. [3] E. Friedman, A. Gal, J. Mares, Phys. Lett. B 725 (2013) 334. [4] A. Cieply, E. Freidman, A. Gal, J. Mares, Nucl. Phys. A 925 (2014) 126. [5] A. Cieply, J. Smejkal, Nucl. Phys. A 881 (2012) 115. [6] A. Budzanowski et al (COSY-GEM Collab.), Phys. Rev. C 79 (2009) 012201(R).