论文标题
$γ$ - 频带原子核的三轴投影壳模型研究
Triaxial projected shell model study of $γ$-bands in atomic nuclei
论文作者
论文摘要
使用三轴投影壳模型（TPSM）方法对原子核中观察到的$γ$频带进行系统研究。对于大多数$γ$带的均匀旋转成员之间的惊人阶段，对于本工作中研究的核心的核心均具有均匀的I-below-odd-i，在集体模型的框架内，该核被认为是$γ$ -Softness的签名。观察到的是，在研究的二十三个系统中，只有四个核，即$^{76} $ ge，$^{112} $ ru，$^{170} $ er和$^{232} $ the the the the the strage straggt straggit stragging straggrating sugnagger swaggitial ting ofd-i-below-even-i，这是$ cottor的$ note $ note in Indeciate $ nodictiation $ nodictiation $ nodictiation $ nidtic $ nidtic $ n in Indecation $ - 对于所有研究的核，除了上述四个核之外，还将准粒子激发纳入构型混合框架中可将惊人的相位从奇数i-down到均匀的i。此外，通过将集体的Bohr Hamiltonian拟合到TPSM能量，通过比较过渡概率来划定两个模型之间的差异。
A systematic study of $γ$-bands observed in atomic nuclei is performed using the triaxial projected shell model (TPSM) approach. The staggering phase between the even and odd spin members of the $γ$-band for most the nuclei investigated in the present work is found to have even-I-below-odd-I, which in the framework of the collective model is considered as a signature of $γ$-softness. It is observed that out of twenty-three systems studied, only four nuclei, namely, $^{76}$Ge, $^{112}$Ru, $^{170}$Er and $^{232}$Th depict staggering phase with odd-I-below-even-I, which is regarded as an indication of the static $γ$-deformation in the collective model picture. The inclusion of the quasiparticle excitations in the framework of configuration mixing is shown to reverse the staggering phase from odd-I-down to the even-I-down for all the studied nuclei, except for the aforementioned four nuclei. Furthermore, by fitting a collective Bohr Hamiltonian to the TPSM energies, the differences between the two models are delineated through a comparison of the transition probabilities.
