Study of the lowest 2 + excitations and B(E2) transition strengths in relativistic QRPA for Sn-, and Pb-isotopes
Study of the lowest 2 + excitations and B(E2) transition strengths in relativistic QRPA for Sn-, and Pb-isotopes
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DOI：
10.1016/j.physletb.2005.07.031
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发表时间：
2005-09
影响因子：
4.4
通讯作者：
A. Ansari
中科院分区：
文献类型：
--
作者：
A. Ansari
在相对论准粒子无规位相近似下，我们计算了偶数质量数A=10 0-136的低中子锡同位素长链的激发态激发能和约化B(E_2；0+→~(2+))跃迁率。在RQRPA方法中，这是第一次这样的尝试，并与现有的实验数据获得了令人满意的一致。此外，我们预测，在中子幻数为50和82的情况下，B(E_2)值将大幅上升，此时的E_2能量也会比邻近核子的能量大幅上升。这一特征与实验上已知的E_2和B(E_2)在208Pb附近的行为非常相似，这在目前的计算中也得到了很好的再现。
In a relativistic quasiparticle random phase approximation (RQRPA) we have calculated the excitation energies of the first 2+excited states and reduced B(E2;0+→2+) transition rates for very neutron-defficient to neutron-rich long chain of Sn-isotopes with even mass numbers A=100–136. In RQRPA approach this is the first such attempt and a very satisfactory agreement with the available experimental data is obtained. Furthermore, we predict a substantial rise of the B(E2) values at neutron magic numbers 50 and 82, where the E2energy also goes up, rather substantially, compared to that for the immediate neighbours. This feature is quite similar to the already experimentally known behaviour of E2and B(E2) around208Pb, which are also well reproduced in the present calculation.