6+ isomers in neutron-rich Sn isotopes beyond N=82 and effective interactions

被引:12
|
作者
Maheshwari, Bhoomika [1 ]
Jain, Ashok Kumar [1 ]
Srivastava, P. C. [1 ]
机构
[1] Indian Inst Technol, Dept Phys, Roorkee 247667, Uttar Pradesh, India
来源
PHYSICAL REVIEW C | 2015年 / 91卷 / 02期
关键词
STATES;
D O I
10.1103/PhysRevC.91.024321
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Recent observation of the 6(+) seniority isomers and measurements of the B(E2) values in the Sn134-138 isotopes lying close to the neutron drip line have raised some questions about the validity of the currently used effective interactions in the neutron-rich region. Simpson et al. [Phys. Rev. Lett. 113, 132502 (2014)] had to modify the diagonal and nondiagonal nu f(7/2)(2) two-body matrix elements of the V lk interaction by similar to 150 keV in their shell model calculations in order to explain the data of Sn-136. In contrast, we are able to explain the observed energy levels and the B(E2) values after marginal reduction of the same set of matrix elements by 25 keV in the RCDB (renormalized CD-Bonn) interaction. The observed mismatch in reproducing the data of Sn-136 is due to the seniority mixing. Further, we do not find it necessary to consider the core excitations, and the RCDB interaction seems better suited to explain the data beyond N = 82 magic number.
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页数:4
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