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Title: Microscopic calculations of effective charges and quadrupole transition rates in Si, S and Ar isotopes.
Other Titles: حسابات مجهرية في نظائر سيلكون,الكبريت والااركون
Authors: أ.م.د أحمد حسين علي
Keywords: Shell models calculations; Effective charges; Quadrupole transition rates.
Issue Date: 2013
Publisher: Iraqi Journal of Science, 2016, Vol. 57, No.3B, pp:1999-2013
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.
ISSN: 0067-2904
Appears in Collections:البحوث العلمية

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