Eta-mesic nuclei

0489153 - ÚJF 2019 RIV IT eng C - Conference Paper (international conference)
Cieplý, Aleš - Mareš, Jiří - Schäfer, Martin - Barnea, N. - Bazak, B. - Friedman, E. - Gal, A.
Eta-mesic nuclei.
Proceedings of Science. Vol. 310. Trieste: SISSA, 2018, č. článku 203. ISSN 1824-8039.
[XVII International Conference on Hadron Spectroscopy and Structure (Hadron2017). Salamanca (ES), 25.09.2017-29.09.2017]
R&D Projects: GA ČR(CZ) GA15-04301S
Institutional support: RVO:61389005
Keywords : eta nuclear state * nuclei * eta meson
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

In this contribution we report on theoretical studies of eta nuclear quasi-bound states in few- and many-body systems performed recently by the Jerusalem-Prague Collaboration . Underlying energy-dependent eta N interactions are derived from coupled-channel models that incorporate the N*(1535) resonance. The role of self-consistent treatment of the strong energy dependence of subthreshold eta N amplitudes is discussed. Quite large downward energy shift together with rapid decrease of the eta N amplitudes below threshold result in relatively small binding energies and widths of the calculated eta nuclear bound states. We argue that the subthreshold behavior of eta N scattering amplitudes is crucial to conclude whether eta nuclear states exist, in which nuclei the eta meson could be bound and if the corresponding widths are small enough to allow detection of these eta nuclear states in experiment.
Permanent Link: http://hdl.handle.net/11104/0283622