Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-02-28
Phys.Rev. C71 (2005) 044308
Physics
Nuclear Physics
Nuclear Theory
14 pages, 5 figures, to be published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.71.044308
We study Fermi transitions and isospin mixing in an isotopic chain 70-78 Kr considering various approximations that use the same Skyrme-Hartree-Fock single particle basis. We study Coulomb effects as well as the effect of BCS and quasiparticle random phase approximation (QRPA) correlations. A measure of isospin mixing in the approximate ground state is defined by means of the expectation value of the isospin operator squared in N=Z nuclei (which is generalized to N different from Z nuclei). Starting from strict Hartree-Fock approach without Coulomb, it is shown that the isospin breaking is negligible, on the order of a few per thousand for (N-Z)=6, increasing to a few percent with Coulomb. Pairing correlations induce rather large isospin mixing and Fermi transitions of the forbidden type (beta- for N
Alvarez-Rodriguez R.
de Guerra Moya E.
Sarriguren P.
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