Seniority isomerism in proton-rich N=82 isotones and its indication to stiffness of the Z=64 core

Details Seniority isomerism in proton-rich N=82 isotones and its indication to stiffness of the Z=64 core Seniority isomerism in proton-rich N=82 isotones and its indication to stiffness of the Z=64 core

2000-06-07

arxiv.org/abs/nucl-th/0006008v2

Phys.Rev. C62 (2000) 054304; Erratum-ibid. C63 (2001) 029902

Physics

Nuclear Physics

Nuclear Theory

To be published in Phys. Rev. C, Revtex 25 pages with 9 Postscript figures

Scientific paper

10.1103/PhysRevC.63.029902

The $10^+$ and $27/2^-$ isomers of the $Z>64$, $N=82$ nuclei are investigated in the shell model framework. We derive an extended seniority reduction formula for the relevant $E2$ transition strengths. Based on the extended formula, as well as on the approximate degeneracy among the $0h_{11/2}$, $2s_{1/2}$ and $1d_{3/2}$ orbits, we argue that the $B(E2)$ data require the $^{146}$Gd core excitation. The energy levels of both parities and the $B(E2)$ values are simultaneously reproduced by a multi-$j$ shell model calculation with the MSDI, if the excitations from $(0g_{7/2}1d_{5/2})$ to $(0h_{11/2}2s_{1/2}1d_{3/2})$ are taken into account.

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