Microscopic description of spherical to γ-soft shape transitions in Ba and Xe nuclei
Microscopic description of spherical to γ-soft shape transitions in Ba and Xe nuclei
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DOI：
10.1103/physrevc.81.034316
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发表时间：
2010-03
影响因子：
3.1
通讯作者：
Z. P. Li;T. Nikšić;D. Vretenar;J. Meng
中科院分区：
文献类型：
--
作者：
Z. P. Li;T. Nikšić;D. Vretenar;J. Meng
利用激发谱和集体波函数，分析了质量区A>130的Ba和Ba原子核球形和γ软核之间的快速跃迁。集体波函数是通过对四极振动和转动自由度的五维哈密顿量对角化得到的，参数由三轴形状的约束自洽相对论平均场计算确定。结果再现了激发光谱和E2跃迁几率的特征演化，并且在一般情况下，与现有数据得到了很好的一致性。计算出的光谱显示了二阶形状相变的指纹，可以近似地用对应于E（5）动力学对称性的解析解来描述。
The rapid transition between spherical and γ-soft shapes in Ba and Xe nuclei in the mass region A>130 is analyzed using excitation spectra and collective wave functions obtained by diagonalization of a five-dimensional Hamiltonian for quadrupole vibrational and rotational degrees of freedom, with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes. The results reproduce the characteristic evolution of excitation spectra and E2 transition probabilities, and in general, a good agreement with available data is obtained. The calculated spectra display fingerprints of a second-order shape phase transition that can approximately be described by analytic solutions corresponding to the E(5) dynamical symmetry.