Speaker
Prof.
Avraham Gal
(Hebrew University, Jerusalem, Israel)
Description
The onset of Eta(548) binding in nuclei is explored in stochastic variational method (SVM) few-body calculations within a pionless effective field theory (EFT) approach at leading order, using
regulated NN and NNN contact terms and a regulated energy-dependent Eta-N contact term derived from coupled-channel models of the
N*(1535) nucleon resonance. A self consistency procedure is applied
to deal with the energy dependence of the Eta-N subthreshold input, resulting in a weak dependence of the calculated Eta-nuclear binding energies on the EFT regulator. It is found [1] that the onset of
binding Eta-3He requires a minimal value of the real part of the
Eta-N scattering length close to 1 fm, yielding then a few MeV Eta binding in Eta-4He. The onset of binding Eta-4He requires a lower
value which, however, exceeds 0.7 fm. Similar conclusions hold when
the nuclear core dynamics is generated by using semi-realistic NN interactions [2].
[1] N. Barnea, B. Bazak, E. Friedman, A. Gal, arXiv:1703.02861.
[2] N. Barnea, B. Bazak, E. Friedman, A. Gal, in preparation.
Primary author
Prof.
Avraham Gal
(Hebrew University, Jerusalem, Israel)
