HYP2018: 13th International Conference on Hypernuclear and Strange Particle Physics

Antikaon interactions in the nuclear medium and the widths of $K^-$ nuclear states.

Not scheduled

15m

2nd Floor

Abstract Submission

Speaker

Mrs Jaroslava Hrtankova (Nuclear Physics Institute, 250 68 Rez, Czech Republic; Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Brehova 7, 115 19 Prague 1, Czech Republic)

Description

We report on our recent analysis of kaonic atom data [1] and consequent self-consistent calculations of $K^-$ nuclear quasi-bound states in nuclear many-body systems [2,3]. The single-nucleon $K^-$ optical potential developed within several chiral meson-baryon coupled-channel interaction models [4-7] was supplemented by a phenomenological potential representing $K^-$ multinucleon interactions. The multinucleon potential was fitted to kaonic atom data for each chiral $K^-N$ amplitude model separately and the total $K^-$ potential was further confronted with branching ratios of $K^-$ absorption at rest [1]. We demonstrate that the $K^-$ multinucleon absorption gives rise to substantial increase of the widths of $K^-$ nuclear states. The only two models [4,5] acceptable by the analysis [1] yield widths considerably larger than the corresponding $K^-$ binding energies. Identification of such states in experiment seems thus highly unlikely. [1] E. Friedman, A. Gal, Nucl. Phys. A 959 (2017) 66. [2] J. Hrtankova, J. Mares, Phys. Lett. B 770 (2017) 342. [3] J. Hrtankova, J. Mares, Phys. Rev. C 96 (2017) 015205. [4] A. Cieply, J. Smejkal, Nucl. Phys. A 881 (2012) 115. [5] Y. Ikeda, T. Hyodo, W. Weise, Nucl. Phys. A 881 (2012) 98. [6] Z. H. Guo, J. A. Oller, Phys. Rev. C 87 (2013) 035202. [7] M. Mai, U.-G. Meissner, Nucl. Phys. A 900 (2013) 51.