论文标题
签名依赖的三轴性，用于从迅速旋转$^{40} $ ca和$^{41} $ ca中从超级形成的形状演变而来
Signature dependent triaxiality for shape evolution from superdeformation in rapidly rotating $^{40}$Ca and $^{41}$Ca
论文作者
论文摘要
我们根据核能密度的功能方法，在高旋转时调查了$^{40} $ ca和$^{41} $ ca在yrast线附近的高度延长形状的可能发生。不仅可以通过在三维坐标空间表示中求解曲柄的Skyme-kohn-Sham方程来描述SuperDeformed（SD）yrast yrast配置，而且SD频段顶部的Yrare配置。建议一些激动的SD频段经过频段交叉，并发展为$^{40} $ CA中的$ j \ simeq 25 \ hbar $以上的超态度（HD）。我们发现，响应旋转的三轴性变化对于向HD的形状演变起了决定性的作用，并且这受低自旋旋转最后一个被占领轨道的标志性量子数的控制。可以在$^{41} $ ca中对正态SD yrast签名 - 合作带的实验观察中进行验证，其中一个（$α=+1/2 $）经历了与HD领带的交叉点（$α=+1/2 $），而另一个（$α= -1/2 $）从低旋转型旋转的集体旋转中表明了平稳的旋转旋转，以替代旋转。
We investigate the possible occurrence of the highly-elongated shapes near the yrast line in $^{40}$Ca and $^{41}$Ca at high spins on the basis of the nuclear energy-density functional method. Not only the superdeformed (SD) yrast configuration but 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 the hyperdeformation (HD) beyond $J \simeq 25 \hbar$ in $^{40}$Ca. We find that the change of triaxiality in response to rotation plays a decisive role for 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 in $^{41}$Ca, one of which ($α=+1/2$) undergoes crossings with the HD band while the other ($α=-1/2$) shows the smooth evolution from the collective rotation at low spins to the non-collective rotation with oblate shape at the termination.
