Research of electromagnetic transitions and beta decays of unstable nuclei

不稳定核的电磁跃迁和β衰变研究

• 批准号: 13640262
• 负责人: YOSHINAGA Naotaka
• 金额: $ 0.32万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640262/
• 关键词: Nuclear Structure; Unstable nuclei; Electromagnetic transitions; Beta decay; Shell model; Pair model; 奇核; ペア近似

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.

在大约130个大约130个地区，发现了有趣的现象，例如高旋转异构体，靠近现象，三方变形，手性带。此外，这些核提供了有关超新星爆炸中大量物种的必要信息。在这项研究中处理的细胞核既不是振动也不是旋转核，因此无法用平均场理论来描述。我们用成对截断的模型来描述它们，该模型假定角动量0和2集合对。在 ^<132> ba中，我们成功地重现了基态频段，Quasi-gamma频段，并在反向弯曲区域中。由于磁偶极矩的10^+状态，因此由中子对准中子的对准而证实。针对XE同位素进行了类似的研究，预测了在8^+状态上方的10+异构体。在 ^<132> la中，理论上预测了手性带。但是，我们已经预测，中子和质子的两个角动量与正交相当平行。作为初步计算，我们表明我们的模型也具有β衰变的预测能力。

项目成果

K.Enami: "Generator coordinate method combined with exact triaxial spin projection"Physical Review C. 63. 044322-044335 (2001)

K.Enami：“与精确三轴自旋投影相结合的发生器坐标法”Physical Review C. 63. 044322-044335 (2001)

K.Higashiyama: "Shell model study of backbending phenomena in Xe isotopes"Physical Review C. 65. 054317-054325 (2002)

K.Higashiyama：“Xe 同位素后弯现象的壳模型研究”Physical Review C. 65. 054317-054325 (2002)

K.Enami, K.Tanabe, N. Yoshinaga: "Generator coordinate method combined with exact triaxial spin projection"Physical Review. C63. 044322-1-13 (2001)

K.Enami、K.Tanabe、N. Yoshinaga：“与精确三轴自旋投影相结合的发生器坐标法”物理评论。

K.Enami, K.Tanabe, N. Yoshinaga: "Quantum-number-projected generator coordinate method and the shell model"Physical Review. C65. 064308-1-14 (2002)

K.Enami、K.Tanabe、N. Yoshinaga：“量子数投影发生器坐标方法和壳模型”物理评论。

K.Enami: "Quantum-number-projected generator coordinate method analysis of low-lying states in ^<130,132>Xe"Physical Review C. 66. 047301-047305 (2002)

K.Enami：“^<130,132>Xe 中低洼态的量子数投影发生器坐标法分析”物理评论 C. 66. 047301-047305 (2002)