Microscopic calculations of effective charges and quadrupole transition rates in Si, S and Ar isotopes.

Authors

  • R. A. Radhi Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
  • A. H. Ali Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq

Keywords:

Shell models calculations, Effective charges, Quadrupole transition rates

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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Published

2022-04-28

Issue

Section

Physics

How to Cite

Microscopic calculations of effective charges and quadrupole transition rates in Si, S and Ar isotopes. (2022). Iraqi Journal of Science, 57(3B), 1999-2013. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6908

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