Abstract

Quadrupole transition rates and effective charges are calculated for even-even Si, S and Ar isotopes based on sd and sdpf -shell model spaces. Shell model calculations are performed with sd shell-model space for neutron number (N) ≤ 20 and sdpf shell-model space for N > 20. Excitation out of major shell space are taken into account through a microscopic theory which allows particle-hole excitation from the core and model space orbits to all higher orbits with 2 excitation. Effective charges are obtained for each isotope. The results show a systematic increase in the B(E2) values for N ≥20. Shell model calculation predicts the erosion of the N=28 magicity in the neutron rich 42Si. No clear indications about the erosion of the shell gap closure in 44S and 46Ar isotope.

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The article was added to IASJ on 2017-02-09

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