Microscopic Dynamics of Large-Scale Deformation and Shape Coexistence in Nuclei

原子核中大尺度变形与形状共存的微观动力学

• 批准号: 16540249
• 负责人: MATSUYANAGI Kenichi
• 金额: $ 1.86万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540249/
• 关键词: Superdeformed nuclei; High-spin state; Unstable nuclei; Collective Excitation; Shape Coexistence; Non-axial Deformation; Hartree-Fock Method; Nuclear Structure; 非軸対称変形; アイソマー

1)To explore soft modes of excitation in unstable nuclei close to the neutron drip line, we have systematically carried out quasiparticle RPA calculations taking into account pairing correlations, deformations of the mean field, and excitations into the continuum. The result indicates that a new kind of soft mode associated with the neutron skin degree of freedom will emerge : in particular, in deformed neutron rich nuclei, low-frequency 0+ excitations will be generated by coherent motions of anisotropic pair fluctuations and deformations of the neutron skin.2)We have formulated a new theory of large amplitude collective motion, called Adiabatic Self-Consistent Collective Coordinate (ASCC) method, that is invariant against a gauge transformation associated with particle number fluctuations. This theory has been applied to the shape coexistence phenomena in nuclei around Se68. We have thus succeeded in microscopically determining the collective path that connects the oblate and prolate local minima in the mean field. We have found a significant enhancement of collective inertia due to the time-odd components of the mean field.

1）为了探索中子滴线附近不稳定核中的软激发模式，我们系统地进行了准粒子RPA计算，考虑了配对相关性、平均场的变形和连续体的激发。结果表明，将出现一种与中子皮自由度相关的新软模式：特别是在变形富中子核中，各向异性对涨落和中子皮变形的相干运动将产生低频0+激励。2）我们提出了一种新的大振幅集体运动理论，称为绝热自洽集体坐标（ASCC）方法， 这对于与粒子数波动相关的规范变换是不变的。该理论已应用于 Se68 周围原子核的形状共存现象。因此，我们成功地在微观上确定了连接平均场中扁形和长形局部最小值的集体路径。我们发现，由于平均场的时间奇数分量，集体惯性显着增强。

项目成果

Mixed Representation RPA Calculation for Octupole Excitations on Superdeformed Sates in the 40Ca and Neutron-Rich Sulfur Regions

40Ca 和富中子硫区域超变形态八极激发的混合表示 RPA 计算

• 发表时间: 2006
• 期刊: Nucl. Phys. A 768
• 作者: A.Dote;H.Horiuchi;Y.Akaishi;T.Yamazaki;堀内 昶;N.Hinohara;T.Inakura
• 通讯作者: T.Inakura

Dynamical Moments of Inertia and Wobbling Motions in Triaxial Superdeformed Nuclei

三轴超变形核中的动态惯性矩和摆动运动

• 发表时间: 2005
• 期刊: Proceedings of the Conference on Nuclei at the Limits (American Institute of Physics, 2005) CP764
• 作者: A.Dote;H.Horiuchi;Y.Akaishi;T.Yamazaki;堀内 昶;N.Hinohara;T.Inakura;K.Yoshida;K.Yoshida;Y.R.Shimizu;M.Matsuzaki;K.Yoshida;K.Yoshida;K.Yoshida;T.Inakura;M.Kobayasi;M.Matsuzaki
• 通讯作者: M.Matsuzaki

Dynamical pairing effects on low-frequency modes of excitation in deformed Mg isotopes close to the neutron drip line

中子滴线附近变形镁同位素低频激发模式的动力学配对效应

• 发表时间: 2006
• 期刊: Physica Scripta T 125
• 作者: A.Dote;H.Horiuchi;Y.Akaishi;T.Yamazaki;堀内 昶;N.Hinohara;T.Inakura;K.Yoshida;K.Yoshida
• 通讯作者: K.Yoshida

Gauge-Invariant Formulation of the Adiabatic Self-Consistent Collective Coordinate Method

• DOI: 10.1143/ptp.117.451
• 发表时间: 2007-01
• 期刊: Progress of Theoretical Physics
• 作者: N. Hinohara;T. Nakatsukasa;M. Matsuo;K. Matsuyanagi

Comparative Study of Octupole Excitations on Superdeformed States in 32S, 36S, 40Ca and 50S

32S、36S、40Ca和50S超变形态八极子激发的比较研究

• 发表时间: 2005
• 期刊: Prog. Theor. Phys. 113
• 作者: A.Dote;H.Horiuchi;Y.Akaishi;T.Yamazaki;堀内 昶;N.Hinohara;T.Inakura;K.Yoshida;K.Yoshida;Y.R.Shimizu;M.Matsuzaki;K.Yoshida;K.Yoshida;K.Yoshida;T.Inakura;M.Kobayasi;M.Matsuzaki;K.Yoshida
• 通讯作者: K.Yoshida