Triaxial shapes of rotating nuclei with neutron numbers 88, 89, 90
Triaxial shapes of rotating nuclei with neutron numbers 88, 89, 90
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DOI：
10.1016/0370-2693(83)91277-7
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发表时间：
1983-06
影响因子：
4.4
通讯作者：
S. Frauendorf;F. May
中科院分区：
文献类型：
--
作者：
S. Frauendorf;F. May
本文用曲柄壳模型研究了高j准粒子驱动旋转核向三轴方向运动的趋势。根据化学势在J壳层中的位置，准粒子倾向于不同的γ值，这可能在γ软核中引起显著的组态依赖的γ形变。作为一个例子，本文研究了Z = 66，67，N = 88，89，90核素的转动谱。平衡γ值是通过最小化基态形变能、转动能和准粒子能的唯象表达式之和而得到的。准粒子vi 132（驱动到γ > 0）和h112（驱动到γ < 0）之间的竞争导致了组态之间的γ-翻转，表现为签名分裂和E2-跃迁几率的变化，这可能与形变能的长扁差有关.
The tendency of high-j quasiparticles to drive rotating nuclei towards triaxial shapes is studied by means of the Cranked Shell Model. Depending on the position of the chemical potential within the j-shell different γ-values are prefered by the quasiparticles, which may induce significant configuration dependent γ-deformations in γ-soft nuclei. As an example the rotational spectra of Z = 66, 67, N = 88, 89, 90 nuclids are studied. Equilibrium γ-values are found by minimizing the sum of phenomenological expressions for the ground state deformation- and rotational energies and the quasiparticle energies. The competition between ν i13 2(driving to γ > 0) and h11 2(driving to γ < 0) quasiparticles causes a γ-flip-flop between the configurations observed as changes of the signature splitting and E2-transition probabilities, which may be related to the prolate-oblate difference of the deformation energy.