Self-Consistent Tilted-Axis-Cranking Study of Triaxial Strongly Deformed Bands in 158Er at Ultrahigh Spin

被引：24
作者：
Shi, Yue [1 ,2 ,3 ,4 ]
Dobaczewski, J. [4 ,5 ]
Frauendorf, S. [6 ]
Nazarewicz, W. [2 ,3 ,5 ]
Pei, J. C. [2 ,3 ,7 ]
Xu, F. R. [1 ]
Nikolov, N. [2 ]
机构：
[1] Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China
[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[3] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
[4] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland
[5] Univ Warsaw, Inst Theoret Phys, Fac Phys, PL-00681 Warsaw, Poland
[6] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
[7] Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 09期
基金：
芬兰科学院;
关键词：
PARTICLE-HOLE EXCITATIONS; ROTATING NUCLEI; PARAMETRIZATION; TERMINATION;
D O I：
10.1103/PhysRevLett.108.092501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Stimulated by recent experimental discoveries, triaxial strongly deformed (TSD) states in Er-158 at ultrahigh spins have been studied by means of the Skyrme-Hartree-Fock model and the tilted-axis-cranking method. Restricting the rotational axis to one of the principal axes-as done in previous cranking calculations-two well-defined TSD minima in the total Routhian surface are found for a given configuration: one with positive and another with negative triaxial deformation gamma. By allowing the rotational axis to change direction, the higher-energy minimum is shown to be a saddle point. This resolves the long-standing question of the physical interpretation of the two triaxial minima at a very similar quadrupole shape obtained in the principal-axis-cranking approach. Several TSD configurations have been predicted, including a highly deformed band, which is a candidate for the structure observed in experiment.
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页数：5
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