eta-nuclear bound states revisited

0397830 - ÚJF 2014 RIV NL eng J - Journal Article
Friedman, E. - Gal, A. - Mareš, Jiří
eta-nuclear bound states revisited.
Physics Letters. B. Roč. 725, 4-5 (2013), s. 334-338. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR(CZ) GAP203/12/2126
Institutional support: RVO:61389005
Keywords : meson-baryon interactions * mesons in nuclear matter * Mesic nuclei
Subject RIV: BE - Theoretical Physics
Impact factor: 6.019, year: 2013

he strong energy dependence of the s-wave eta N scattering amplitude at and below threshold, as evident in coupled-channels K-matrix fits and chiral models that incorporate the S-11 N*(1535) resonance, is included self-consistently in eta-nuclear bound-state calculations. This approach, applied recently in calculations of kaonic atoms and (K) over bar -nuclear bound states, is found to impose stronger constraints than ever on the onset of eta-nuclear binding, with a minimum value of Rea(eta N) approximate to 0.9 fm required to accommodate an eta-He-4 bound state. Binding energies and widths of eta-nuclear states are calculated within several underlying eta N models for nuclei across the periodic table, including Mg-25(eta) for which some evidence was proposed in a recent COSY experiment.
Permanent Link: http://hdl.handle.net/11104/0225461