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首页> 外文会议>Internet symposium on nuclear data >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：核β腐烂的总理论的改进，以及第一次禁止禁止过渡的障碍1

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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，核β-腐烂的总理论是精制奇数核核。在这种改进中，根据统计考虑，考虑了从地面奇核地区到偶数核的地面态度的β-转换的选择规律的影响。根据选择规则，还考虑到偶核偶核中的前2〜+激发态的过渡。在该研究中，发现奇数核核和0〜+接地状态的V接地状态之间的过渡，均强烈地阻碍了依纪的秩序1的第一禁止禁止的转变。引入减少因子用于过渡到偶核的地面状态，以考虑这种障碍。还发现，从传统的总理论获得的Gamow-Threader转变的强度功能被尺寸为约3.为了改善这种低估，采用了一种粒子强度功能来采用洛伦兹型功能在模型中而不是双曲线型函数。在本研究中，我们已经新分析了奇核核的实验性FT值，并发现秩1的第一禁止转变也在地面态之间受到相当关节。在上述改进之后，我们已经通过使用精致的总理论计算了一些奇数短寿命裂变产品的β射线光谱。这些结果不仅使用Rudstam等人的实验。但也与传统的总理论。

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