Signature-dependent triaxiality for shape evolution from superdeformation in rapidly rotating 40Ca and 41Ca

Signature-dependent triaxiality for shape evolution from superdeformation in rapidly rotating 40Ca and 41Ca
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快速旋转 40Ca 和 41Ca 中超变形形状演化的特征相关三轴性

DOI:
10.1093/ptep/ptaa071
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发表时间:
2020
影响因子:
3.5
通讯作者:
Matsuo Masayuki
Matsuo Masayuki
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Sakai Shinkuro;Yoshida Kenichi;Matsuo Masayuki

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我们基于核能密度泛函方法研究了印加和Ca在高自旋时在yrast线附近可能出现的高度细长形状。超变形(SD)yrast配置和SD带顶部的yrare配置都通过求解三维坐标空间表示中的曲柄Skyme-Kohn-Sham方程来描述。结果表明,部分激发态SD带发生了带交叉,并发展为超形变(HD)。我们发现,响应于旋转的三轴度的变化在形状演化中起着决定性的作用,向HD,这是由签名量子数的最后占据的轨道在低自旋。这一机制可以在印加正宇称SD yrast签名伙伴带的实验观测中得到验证,其中一个()与HD带交叉,而另一个()显示出从低自旋集体旋转到非集体旋转的平滑演化,终止时呈扁球形。
We investigate the possible occurrence of highly elongated shapes near the yrast line inCa andCa at high spins on the basis of the nuclear energy-density functional method. Both the superdeformed (SD) yrast configuration and the yrare configurations on top of the SD band are described by solving the cranked Skyme–Kohn–Sham equation in the three-dimensional coordinate space representation. It is suggested that some of the excited SD bands undergo band crossings and develop to hyperdeformation (HD) beyondinCa. We find that the change of triaxiality in response to rotation plays a decisive role in the shape evolution towards HD, and that this is governed by the signature quantum number of the last occupied orbital at low spins. This mechanism can be verified in an experimental observation of the positive-parity SD yrast signature-partner bands inCa, one of which () undergoes crossings with the HD band, while the other () shows smooth evolution from collective rotation at low spins to non-collective rotation with an oblate shape at termination.
DOI: 10.1103/physrevc.94.014310
发表时间: 2016-06
期刊: Physical Review C
影响因子: 3.1
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DOI: 10.1140/epja/i2002-10125-6
发表时间: 2003
期刊: The European Physical Journal A - Hadrons and Nuclei
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