Effect of pairing correlations on the isospin-mixing parameter in deformed N = Z even-even nuclei

J. Le Bloas; L. Bonneau; P. Quentin; J. Bartel; D. D. Strottman

doi:10.1103/PhysRevC.86.034332

Effect of pairing correlations on the isospin-mixing parameter in deformed N = Z even-even nuclei

J. Le Bloas ¹ L. Bonneau ¹ P. Quentin ¹ J. Bartel ² D. D. Strottman

1 THEO

CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

2 IPHC - Institut Pluridisciplinaire Hubert Curien

Abstract : 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.

Document type :

Journal articles

Physical Review C, American Physical Society, 2012, 86, pp.034332. <10.1103/PhysRevC.86.034332>

Domain :

Physics / Nuclear Theory

http://hal.in2p3.fr/in2p3-00747326
Contributor : Nathalie Martin <>
Submitted on : Wednesday, October 31, 2012 - 9:25:36 AM
Last modification on : Monday, October 13, 2014 - 3:43:25 PM

Effect of pairing correlations on the isospin-mixing parameter in deformed N = Z even-even nuclei

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