Isospin mixing and the continuum coupling in weakly bound nuclei

Details Isospin mixing and the continuum coupling in weakly bound nuclei Isospin mixing and the continuum coupling in weakly bound nuclei

2009-11-25

arxiv.org/abs/0911.4902v5

Phys.Rev.C82:044315,2010

Physics

Nuclear Physics

Nuclear Theory

10 pages, 5 figures ; published version

Scientific paper

10.1103/PhysRevC.82.044315

The isospin breaking effects due to the Coulomb interaction in weakly-bound nuclei are studied using the Gamow Shell Model, a complex-energy configuration interaction approach which simultaneously takes into account many-body correlations between valence nucleons and continuum effects. We investigate the near-threshold behavior of one-nucleon spectroscopic factors and the structure of wave functions along an isomultiplet. Illustrative calculations are carried out for the T=1 isobaric triplet. By using a shell-model Hamiltonian consisting of an isoscalar nuclear interaction and the Coulomb term, we demonstrate that for weakly bound or unbound systems the structure of isobaric analog states varies within the isotriplet and impacts the energy dependence of spectroscopic factors. We discuss the partial dynamical isospin symmetry present in isospin-stretched systems, in spite of the Coulomb interaction that gives rise to large mirror symmetry breaking effects.

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