Studies of kaonic atoms and nuclei

0509990 - ÚJF 2020 RIV US eng C - Conference Paper (international conference)
Friedman, E. - Gal, A. - Óbertová, Jaroslava - Mareš, Jiří
Studies of kaonic atoms and nuclei.
AIP Conference Proceedings. Vol. 2130. Melville: American Institute of Physics Inc., 2019, č. článku 020013. ISBN 978-0-7354-1872-1. ISSN 0094-243X.
[13th International Conference on Hypernuclear and Strange Particle Physics. Portsmouth (US), 24.06.2018-29.06.2018]
Institutional support: RVO:61389005
Keywords : resonance * baryons * kanoic atoms
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

This contribution reviews recent studies of kaonic atoms and nuclei performed by the Jerusalem-Prague Collaboration using K- optical potentials derived from state-of-the-art chirally-motivated meson-baryon coupled-channel interaction models. Underlying free-space K-N scattering amplitudes are modified to account for in-medium effects caused by Pauli blocking. Strong energy dependence of the amplitudes near threshold is treated self-consistently, which leads to substantial downward subthreshold energy shift. Thorough analyses of kaonic atoms revealed that these K- optical potentials derived within chiral EFT approaches have to be supplemented by a phenomenological term representing K- multi-nucleon interactions in the medium in order to achieve good fits of strong-interaction level shifts and widths in kaonic atoms across the periodic table. It is found that only two of the considered models are simultaneously capable of reproducing the single-nucleon K- absorption fractions at rest from bubble chamber experiments. These models are then applied in optical model calculations of kaonic nuclei. The K- multi-nucleon absorption is found to have a decisive impact on the widths of K--nuclear quasi-bound states which are excessively large. The detection of kaonic nuclear states is thus most probably limited to the lightest few-body nuclear systems.
Permanent Link: http://hdl.handle.net/11104/0300559