Microscopic calculations of effective charges and quadrupole transition rates in Si, S and Ar isotopes | ||
| Iraqi Journal of Science | ||
| Article 1, Volume 57, Issue 3, July 2016, Pages 1999-2013 | ||
| Authors | ||
| A. H. Ali; R. A. Radhi | ||
| 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. | ||
| Keywords | ||
| Shell models calculations; Effective charges; Quadrupole transition rates | ||
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