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arXiv 0705.2169nucl-th
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相互作用矢量玻色子模型框架下奇质量核的集体态

Collective states of the odd-mass nuclei within the framework of the Interacting Vector Boson Model

H. G. Ganev

摘要:

为了将费米子自由度纳入核动力学中并包括奇质量核的处理,本文将相互作用矢量玻色子模型(IVBM)的动力学对称群$Sp^{B}(12,R)$超对称推广到正交辛群$OSp(2Ω/12,R)$.超群的玻色子扇形被用来描述相邻偶-偶核的复杂集体谱,并被认为是奇核的一种核结构。费米子扇区由费米子自旋群$SO^{F}(2Ω)\supset SU^{F}(2)$表示。由此得到的新的精确可解极限情形被用于描述奇质量核的集体谱。对稀土区的三个奇质量核$^{157}Gd$、$^{173}Yb$和$^{163}Dy$的不同集体带的理论预言与实验进行了比较。还研究了$^{157}Gd$和$^{163}Dy$在基态之间的$B(E2)$跃迁几率。揭示了模型的辛结构对正确再现$B(E2)$行为的重要作用。所得结果揭示了模型扩展的适用性。

英文摘要:

A supersymmetric extension of the dynamical symmetry group $Sp^{B}(12,R)$ of the Interacting Vector Boson Model (IVBM), to the orthosymplectic group $OSp(2Ω/12,R)$ is developed in order to incorporate fermion degrees of freedom into the nuclear dynamics and to encompass the treatment of odd mass nuclei. The bosonic sector of the supergroup is used to describe the complex collective spectra of the neighboring even-even nuclei and is considered as a core structure of the odd nucleus. The fermionic sector is represented by the fermion spin group $SO^{F}(2Ω)\supset SU^{F}(2)$. The so obtained, new exactly solvable limiting case is applied for the description of the nuclear collective spectra of odd mass nuclei. The theoretical predictions for different collective bands in three odd mass nuclei, namely $^{157}Gd$, $^{173}Yb$ and $^{163}Dy$ from rare earth region are compared with the experiment. The $B(E2)$ transition probabilities for the $^{157}Gd$ and $^{163}Dy$ between the states of the ground band are also studied. The important role of the symplectic structure of the model for the proper reproduction of the $B(E2)$ behavior is revealed. The obtained results reveal the applicability of the models extension.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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