International Conference on Exotic Atoms and Related Topics - EXA2017

We report on our very recent self-consistent calculations of $K^-$-nuclear quasi-bound states [1]. Relevant $K^-$ optical potentials were developed within several chiral meson-baryon coupled-channel interaction models [2-5]. The applied models yield quite different $K^-$ binding energies and widths [6]. Then, the $K^-$ multinucleon interactions were incorporated by a phenomenological optical potential introduced recently to achieve good fits to kaonic atom data [7]. Our calculations show that the effect of $K^-$ multinucleon interactions on $K^-$ widths in nuclei is decisive. The resulting widths are considerably larger than corresponding binding energies. Moreover, when the density dependence of the $K^-$ multinucleon interactions derived in the fits of kaonic atoms is extended to the nuclear interior, the only two models acceptable after imposing as additional constraint the single-nucleon fraction of $K^-$ absorption at rest do not yield any kaonic nuclear bound state in majority of considered nuclei. [1] J. Hrtankova, J. Mares, Phys. Lett. B in print, arXiv:1703.01788v2 [nucl-th]. [2] A. Cieply, J. Smejkal, Nucl. Phys. A 881 (2012) 115. [3] Y. Ikeda, T. Hyodo, W. Weise, Nucl. Phys. A 881 (2012) 98. [4] Z. H. Guo, J. A. Oller, Phys. Rev. C 87 (2013) 035202. [5] M. Mai, U.-G. Meissner, Nucl. Phys. A 900 (2013) 51. [6] J. Hrtankova, J. Mares, subm. Phys. Rev. C, arXiv:1704.07205 [nucl-th]. [7] E. Friedman, A. Gal, Nucl. Phys. A 959 (2017) 66.