Calculations of η-nuclear quasi-bound states in few-body systems

Abstract

We report on our Stochastic Variational Method (SVM) calculations of η-nuclear quasi-bound states in s-shell nuclei as well as the very recent calculation of the p-shell nucleus 6Li. The ηN potentials used were constructed from ηN scattering amplitudes obtained within coupled-channel models that incorporate N*(1535) resonance. We found that η6Li is bound in the ηN interaction models that yield ReaηN ≥ 0.67 fm. Additional repulsion caused by the imaginary part of ηN potentials shifts the onset of η-nuclear binding to η4He, yielding very likely no quasi-bound state in η3He.