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Effect of pairing correlations on the isospin-mixing parameter in deformed N = Z even-even nuclei
Le Bloas J., Bonneau L., Quentin P., Bartel J., D. Strottman D.
Physical Review C 86 (2012) 034332 - http://hal.in2p3.fr/in2p3-00747326
Physique/Physique Nucléaire Théorique
Effect of pairing correlations on the isospin-mixing parameter in deformed N = Z even-even nuclei
J. Le Bloas1, L. Bonneau1, P. Quentin1, J. Bartel2, D. D. Strottman
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
2 :  IPHC - Institut Pluridisciplinaire Hubert Curien
CNRS : UMR7178 – Université de Strasbourg
Within the particle-number conserving highly truncated diagonalization approach (amounting to a severely truncated shell model built on self-consistent mean-field single-particle states), we investigate the isospin mixing in the ground state of axially deformed even-even N = Z nuclei with A < 80. The Skyrme interaction in its SIII parametrization is used to generate the self-consistent mean-field solution, whereas the effective residual interaction is approximated by density-independent δ interactions in the T = 0 and T = 1 isospin channels. In the correlated ground state of the considered nuclei, the obtained values of the isospin-mixing parameter range from a fewtens of a percent to a couple of percents. The pairing correlations in both isospin channels are found to increase a little the isospin-mixing parameter with respect to the Hartree-Fock value by two competing mechanisms. In the T = 0 channel, isospin mixing is brought mostly by neutron-proton one-pair excitations, whereas in the T = 1 channel it is essentially generated by the difference between neutron-neutron and proton-proton one-pair excitations.

Articles dans des revues avec comité de lecture
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)