Isovector dipole strength in nuclei with extreme neutron excess
Isovector dipole strength in nuclei with extreme neutron excess
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DOI：
10.1103/physrevc.79.034311
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发表时间：
2008-12
影响因子：
3.1
通讯作者：
D. Arteaga;E. Khan;P. Ring
中科院分区：
文献类型：
--
作者：
D. Arteaga;E. Khan;P. Ring
在相对论准粒子随机相近似下，系统地分析了从{132}到{166}的丰中子核的强度。较大的中子过量有利于出现形变的基态。形变核中低激发态强度的演化是由同位旋不对称和形变两个因素相互作用决定的：当较大的中子过剩增加总的低激发态强度时，形变阻碍并扩展低激发态强度。富含中子的形变核可能不像球状核那样适合于低强度的实验研究。
The $E1$ strength is systematically analyzed in very neutron-rich Sn nuclei, beyond $^{132}\mathrm{Sn}$ until $^{166}\mathrm{Sn}$, within the relativistic quasiparticle random phase approximation. The great neutron excess favors the appearance of a deformed ground state for $^{142\ensuremath{-}162}\mathrm{Sn}$. The evolution of the low-lying strength in deformed nuclei is determined by the interplay of two factors, isospin asymmetry and deformation: while greater neutron excess increases the total low-lying strength, deformation hinders and spreads it. Very neutron rich deformed nuclei may not be as good candidates as spherical nuclei like $^{132}\mathrm{Sn}$ for the experimental study of low-lying $E1$ strength.