5 papers · 1 filter
The Pairing interaction in nuclei: comparison between exact and approximate treatments
J. Dukelsky, G. G. Dussel, J. G. Hirsch +1
As a model for a deformed nucleus the many level pairing model (picket fence model with ~100 levels) is considered in four approximations and compared to the exact solution given b…
Restoration of broken symmetries in Self-Consistent RPA
A. Rabhi, P. Schuck, R. Bennaceur +2
It is shown that the Self-Consistent RPA (SCRPA) approach allows in a very natural way to restore symmetries, spontaneously broken on the mean field level. This is achieved via the…
Dropping Sigma-Meson Mass and In-Medium Pion-Pion Correlations
P. SchucK, Z. Aouissat, G. Chanfray +1
The influence of a dropping sigma-meson mass on previously calculated in-medium pion-pion correlations in the J=I=0 (sigma-meson) channel is investigated. It is found that the inva…
In-Medium Correlations in the '-Meson'-Channel
P. Schuck, Z. Aouissat, F. Bonutti +4
The present status of the in-medium invariant mass distribution in the sigma-meson channel around the threshold is reviewed from the theory side and contrasted with recent ex…
Two pion bound states in a hot pion gas
G. Chanfray, P. Schuck, G. Welke
The occurrence of poles in the propagator in a hot pion medium is studied. The domain of non--trivial solutions to the corresponding bosonic gap equation is investigated as a…