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Shell Model Study Of Even-Even 132-136Te Neutron-Rich Nuclei
Fouad A. Majeed
Department of Physics,College of Education/IbnHayyan, Babylon University,
P.O.Box 4, Hilla-Babel, Iraq.
E-mail:fouadalajeeli@yahoo.com
Abstract
Large-scale shell model calculations were performed for neutron-rich even-even 132-136Te using a realistic effective interaction derived from CD- Bonn nucleon-nucleon potential for the positive and negative parity states. The calculated results are compared with the recently available experimental data and with the recent theoretical work. The transition rates B(E2; 0+ ®2+) are also calculated by taking into consideration core polarization effect by choosing best effective charges for proton and neutron. The results of our theoretical calculations are compared with the recent experimental data and with the previous theoretical work. A very good agreement was obtained for all nuclei.
Keywords: Gamma transitions and level energies, Shell model
الخلاصة
أجريت حسابات نموذج القشرة بنطاق واسع للنوى 132-136Te الزوجية-الزوجية الغنية بالنيوترونات بأستخدام التفاعل الواقعي المؤثر المشتق من جهد CD- Bonn للنيوكليون-نيوكليون لكل من مستويات الطاقة الموجبة والسالبة. قورنت النتائج المحسوبة مع البيانات التجريبية المتوفرة حديثا والنتائج النظرية المتوفرة حديثاً. وأيضا فقد تم حساب معدلات الأنتقال B(E2; 0+ ®2+) عن طريق الأخذ بنظر الأعتبار تأثير أستقطاب القلب عن طريق أختيار أفضل الشحنات المؤثرة للبروتون والنيوترون.
قورنت حساباتنا النظرية مع البيانات العملية المتوفرة حديثاً وكذلك مع النتائج النظرية المحسوبة سابقاً وقد وجد أنها تتفق وبشكل جيد لجميع النويات قيد الدراسة.
Introduction
In recent years, there has been significant progress in the experimental knowledge of neutron- rich nuclei with few particles or holes outside doubly magic 132Sn [1]. The region of neutron-rich Sn and Te nuclei with the number of protons at or just above the Z=50 closed shell becomes recently important for study both experimentally and theoretically [2]. Previous shell-model calculations (see Ref. [3] for details) provided reasonable agreement with energy spectra and B(E2) in N=80 and N=82 Sn and Te isotones but failed to explain the B(E2) value in 136Te.
Magnetic moments were calculated for 134Te, 136,137Xe and 137Cs by S. Sarkar and M. Sarkar [4] with the KH5082 and CW5082 interactions fitted in the 208Pb and scaled to the 132Sn region, and with empirical effective single-particle g-factors. Shell- model calculations for the 2+, 4+ and 6+ states in 130-134Te and 132-136Xe were reported in Ref. [5], where the surface delta interaction (SDI) was used with two different sets of parameters. The single particle states were chosen to reproduce single proton states in 133Sb and single neutron states in 131Sn.
- وصف الــ Tags لهذا الموضوع
- energy levels, shell model, oxbash
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