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首页> 外文会议>Internet symposium on nuclear data; 19960408-0615; Tokai(JP) >Refinement of the gross theory of nuclear β-decay, and hindrance of the first-forbidden transition of rank 1
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Refinement of the gross theory of nuclear β-decay, and hindrance of the first-forbidden transition of rank 1

机译：完善了核β衰变的总体理论，并阻碍了等级1的第一个禁变

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摘要

Recently the gross theory of nuclear β-decay was refined for odd-odd nuclei. In this refinement, the effect of the selection rule of β-transitions from the ground states of odd-odd nuclei to those of even-even nuclei was taken into account based on a statistical consideration. The transitions to the first 2~+ excited states in even-even nuclei were also taken into account according to the selection rule approximately. In that study, it was found that the transitions between V ground states of the odd-odd nuclei and 0~+ ground states of even-even nuclei, belonging to the first-forbidden transitions of rank 1, are strongly hindered. A reduction factor was introduced for the transitions to the ground states of even-even nuclei to take into account this hindrance. It was also found that the strength functions of the Gamow-Teller transitions obtained from the conventional gross theory are underestimated by a factor of about 3. In order to improve this underestimation, the Lorentz-type function was adopted for the one-particle strength function in the model instead of the hyperbolic-secant-type function. In the present study we have newly analyzed the experimental ft-values of odd-A nuclei, and found that the first-forbidden transitions of rank 1 are also considerably hindered between the ground states. Following the above refinement we have calculated the β-ray spectra of some odd-odd short-lived fission products with the use of the refined gross theory. These results are compared not only with the experiments by Rudstam et al. but also with the conventional gross theory.
机译：最近，对奇数核进行了核β衰变的总体理论的完善。在该改进方案中，基于统计考虑，考虑了从奇奇数个核的基态到偶数-偶数核的基态的β-转变选择规则的影响。大约根据选择规则，也考虑了偶数原子核中最初的2〜+激发态的跃迁。在该研究中，发现奇数原子核的V基态与偶数原子核的0〜+基态之间的跃迁受到强烈阻碍，这些跃迁属于1级的第一个禁忌跃迁。考虑到这一障碍，为过渡到偶数核的基态引入了一个减小因子。还发现，从常规总理论获得的Gamow-Teller跃迁的强度函数被低估了约3倍。为了改善这种低估，单粒子强度函数采用了Lorentz型函数而不是双曲正割类型函数。在本研究中，我们新近分析了奇数A原子核的实验ft值，发现在基态之间也严重阻碍了等级1的首次禁止跃迁。经过上述改进，我们利用改进的总理论计算了一些奇数短寿命裂变产物的β射线光谱。这些结果不仅与Rudstam等人的实验进行了比较。但也有传统的毛理论。

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