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Isospin nonconservation in sd-shell nuclei

Y. H. Lam 1 N.A. Smirnova 1 E. Caurier 2
1 THEORIE - Physique théorique
CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Abstract : The question of isospin-symmetry breaking in nuclei of the $sd$ shell is addressed. We propose a new global parameterization of the isospin-nonconserving (INC) shell-model Hamiltonian which accurately describes experimentally known isobaric mass splittings. The isospin-symmetry violating part of the Hamiltonian consists of the Coulomb interaction and effective charge-dependent forces of nuclear origin. Particular attention has been paid to the effect of the short-range correlations. The behavior of $b$ and $c$ coefficients of the isobaric-mass-multiplet equation (IMME) is explored in detail. In particular, a high-precision numerical description of the staggering effect is proposed and contribution of the charge-dependent forces to the nuclear pairing is discussed. The Hamiltonian is applied to the study of the IMME beyond a quadratic form in the A=32 quintet, as well as to calculation of nuclear structure corrections to superallowed $0^+ \to 0^+$ Fermi $\beta$ decay, and to amplitudes of Fermi transitions to non-analogue states in sd-shell nuclei.
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Submitted on : Thursday, June 20, 2013 - 8:06:26 AM
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Y. H. Lam, N.A. Smirnova, E. Caurier. Isospin nonconservation in sd-shell nuclei. Physical Review C, American Physical Society, 2013, 87, pp.054304. ⟨10.1103/PhysRevC.87.054304⟩. ⟨in2p3-00835869⟩



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