Research of electromagnetic transitions and beta decays of unstable nuclei

在130附近的质量区，发现了一些有趣的现象，如高自旋异构体、回弯现象、三轴形变、手征带等。此外，这些核提供了有关超新星爆炸中产生的物质丰度的必要信息。在本研究中处理的核既不是振动核也不是转动核，因此不能用平均场理论描述。我们描述他们的对截断模型，假设角动量0和2集体对。在^ Ba中<132>我们成功地再现了基态带、准γ带和背弯区的态。这种回弯是由10^+态的磁偶极矩引起的中子排列引起的。对氘同位素也进行了类似的研究，预测10+异构体的位置刚好在8^+态之上。在^ La中<132>，手征带被理论预测。然而，我们已经预言中子和质子的两个角动量是平行的而不是正交的。作为初步计算，我们已经表明，我们的模型对β衰变也有预测能力。

In the mass region around 130, interesting phenomena are found such as high-spin isomers, backbending phenomena, triaxial deformation, chiral bands. Moreover, these nuclei provide necessary information concerning the abundance of species which are made in supernovae explosions. The nuclei treated in this research are neither vibrational nor rotational nuclei, thus cannot be described in terms of mean field theories. We describe them in terms of the pair-truncated model which assumes angular momentum 0 and 2 collective pairs. In ^<132>Ba we have successfully reproduced ground state band, quasi-gamma band, and states in backbending region. The backbending is confirmed to be caused by the alignment of neutrons due to the magnetic dipole moment of 10^+ state. The similar study has been done for Xe isotopes, predicting the 10+ isomer just above the 8^+ state. In ^<132>La, the chiral band is predicted theoretically. However, we have predicted that two angular momenta by neutrons and protons are rather parallel than orthogonal. As a preliminary calculation, we have shown that our model has a predictive power for the beta decays as well.