Gd同位素核混合对称态

Mixed Symmetry States in Gd Isotopes

本文应用中子-质子相互作用玻色子模型理论数值计算了^(150)Gd、^(152)Gd和^(154)Gd核混合对称态的能量和电磁跃迁几率。计算表明,^(150)Gd核最低能量的混合对称态是2_M^+,而^(152)Gd和^(154)Gd则为1_M^+,随着核子数的增加;B(M1,0_I^+→1_M^+)由小变大,表现出U(5)极限向SU(3)极限的转移。另外Majorana相互作用对混合对称态能量和电磁跃迁几率的影响也作了讨论。

The mixed symmetry states in nuclei of ^(150)Gd, ^(152)Gd and ^(154)Gd are numerically studied with the theory of the neutron-proton interacting boson model. It shows that the mixed state of the lowest energy in ^(150)Gd nuclide is 2_M^+ but ones in ^(152)Gd and ^(154)Gd are 1_M^+ and that the value of B(M1,0_1^+-1_M^+) increases with the total nucl- eon number of Gd isotopes, which indicate a transition from U(5) limit to SU(3) limit. The influence of the Majorana interaction on the energy and electromagnetic transition probability of the mixed symmetry state is also discussed.