论文标题
快速旋转的$^{140} $ gd核中的形状演变
Shape evolution in the rapidly rotating $^{140}$Gd nucleus
论文作者
论文摘要
$^{140} $ gd的基态乐队在$^{112} $ sn（$^{35} $ cl，〜$α$ p2n）$^{140} $ gd反应的$^{112} $ sn（$^{35} $ cl，〜$^{35} $ cl（$^{35} $ cl，〜$^{35} $ cl，〜$α$ p2n）$^{140} $ gd反应，使用Compton抑制的HPGE Clofers of Tection设置。除其他光谱测量值外，使用多普勒换档衰减方法提取了状态的水平寿命。提取的四极力矩以及配对的独立曲柄Nilsson -Strutinsky模型计算四极带的计算表明，该核最好以$γ$ = -30 $^\ circ $获得三轴性。该计算显示出在高旋转$ \ sim $ 30 $ \ hbar $上围绕最长可能的主轴旋转的可能性，这超出了本实验的范围。
Ground state band of $^{140}$Gd has been investigated following their population in the $^{112}$Sn($^{35}$Cl,~$α$p2n)$^{140}$Gd reaction at 195 MeV of beam energy using a large array of Compton suppressed HPGe clovers as the detection setup. Apart from other spectroscopic measurements, level lifetimes of the states have been extracted using the Doppler Shift Attenuation Method. Extracted quadrupole moment along with the pairing independent cranked Nilsson-Strutinsky model calculations for the quadrupole band reveal that the nucleus preferably attains triaxiality with $γ$ = -30$^\circ$. The calculation though shows a slight possibility of rotation around the longest possible principal axis at high spin $\sim$ 30$\hbar$ which is beyond the scope of the present experiment.
