R A Radhi
University of Baghdad, Iraq
Title: Calculation of quadrupole transition rates in cross sd-pf shell isotopes (Si, S and Ar)
Biography
Biography: R A Radhi
Abstract
Quadrupole transition rates and effective charges are calculated for even-even Si, S and Ar isotopes with N>20. Shell model calculations are performed with sd-shell model space for protons and sdpf shell-model space for neutrons. 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 excitation. Effective charges are obtained for each isotope with N<20 and average effective charges are extracted and used for each nucleus. The results show a systematic increase in the B (E2) values. 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 isotopes.