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arXiv 1707.01293nucl-th
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Gamow-Teller激发态的原子核结构特征

Nuclear Structure Features of Gamow-Teller Excitations

Vladimir Zelevinsky, Naftali Auerbach, Bui Minh Loc

摘要:

核的伽莫夫-泰勒跃迁是淬灭的,这一点已被广泛接受;壳模型计算也表明伽莫夫-泰勒强度与集体四极激发从基态跃迁的速率之间存在着明显的负相关关系。我们讨论的物理学超越了这一观察。它是基于自旋-轨道耦合的存在,这是自共轭核(N = Z)中Gamow-Teller跃迁几率非零的原因。在fp-空间的壳模型计算表明,逐渐人工去除的自旋轨道耦合的影响,以相反的方式影响Gamow-Teller和四极模的效果。现实的自旋轨道分裂移动累积伽莫夫-泰勒强度,并导致更强的碎裂,这两种趋势进行了讨论,在简单的对称性参数。随着这个过程,伽莫夫-泰勒算子除了激发L = 0状态的主线之外,还激发了L = 2的状态,这些状态应该加上干涉项,以说明总强度。

英文摘要:

It is widely accepted that nuclear Gamow-Teller transitions are quenched; shell-model calculations also showed a clear anticorrelation between the Gamow-Teller strength and the transition rate of the collective quadrupole excitation from the ground state. We discuss the physics beyond this observation. It is based on the existence of spin-orbit coupling that is responsible for the non-zero probabilities of Gamow-Teller transitions in self-conjugate nuclei (N = Z). The shell-model calculations in the f p-space demonstrate the effects of the gradual artificial removal of the spin-orbit coupling that influences Gamow-Teller and quadrupole modes in opposite way. The realistic spin-orbit splitting moves the cumulative Gamow-Teller strength up and leads to stronger fragmentation; both trends are discussed in terms of simple symmetry arguments. Along with this process, the Gamow-Teller operator excites, in addition to the main line of L = 0 states, states with L = 2 which should be added, with the interference terms, to account for the total strength.

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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