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Possible triaxial deformation in N = Z nucleus germanium-64

文献类型：期刊论文

作者Shui-Fa, Shen1,2,3,4; Hua-Lei, Wang5; Hai-Yan, Meng5; Yu-Peng, Yan6,7; Jie-Jie, Shen8; Fei-Peng, Wang2; Hai-Bin, Jiang3; Li-Na, Bao9
刊名ACTA PHYSICA SINICA
出版日期2021-10-05
卷号70
ISSN号1000-3290
关键词triaxial deformation total Routhian surface shape evaluation
DOI10.7498/aps.70.20210187
通讯作者Shui-Fa, Shen(shuifa.shen@inest.cas.cn)
英文摘要Evidence for nonaxial gamma deformations has been widely found in collective rotational states. The gamma deformation has led to very interesting characteristics of nuclear motions, such as wobbling, chiral band, and signature inversion in rotational states. There is an interesting question; why the nonaxial gamma deformation is not favored in the ground states of even-even (e-e) nuclei. The quest for stable triaxial shapes in the ground states of e-e nuclei, with a maximum triaxial deformation of vertical bar gamma vertical bar approximate to 30 degrees, is still a major theme in nuclear structure. In the present work, we use the cranked Woods-Saxon (WS) shell model to investigate possible triaxial shapes in ground and collective rotational states. Total-Routhian-surface calculations by means of the pairing-deformation-frequency self-consistent cranked shell model are carried out for even-even germanium and selenium isotopes, in order to search for possible triaxial deformations of nuclear states. Calculations are performed in the lattice of quadrupole (beta(2), gamma) deformations with the hexadecapole beta(4) variation. In fact, at each grid point of the quadrupole deformation (beta(2), gamma) lattice, the calculated energy is minimized with respect to the hexadecapole deformation beta(4). The shape phase transition from triaxial shape in Ge-64, oblate shape in Ge-66, again through triaxiality, to prolate deformations is found in germanium isotopes. In general, the Ge and Se isotopes have gamma-soft shapes, resulting in significant dynamical triaxial effect. There is no evidence in the calculations pointing toward rigid triaxiality in ground states. The triaxiality of gamma = -30 degrees for the ground and collective rotational states, that is the limit of triaxial shape, is found in Ge-64,Ge-74. One should also note that the depth of the triaxial minimum increases with rotational frequency increasing in these two nuclei. The present work focuses on the possible triaxial deformation of N = Z nucleus Ge-64. Single-particle level diagrams can give a further understanding of the origin of the triaxiality. Based on the information about single-particle levels obtained with the phenomenological Woods-Saxon (WS) potential, the mechanism of triaxial deformation in N = Z nucleus 6(4G)e is discussed, and caused surely by a deformed gamma approximate to 30 degrees shell gap at Z(N) = 32. At N = 34, however, an oblate shell gap appears, which results in an oblate shape in Ge-66 (N = 34). With neutron number increasing, the effect from the N = 34 oblate gap decreases, and hence the deformations of heavier Ge isotopes change toward the triaxiality (or prolate).
WOS关键词COULOMB-EXCITATION ; QUADRUPOLE-MOMENTS ; SHAPES ; ASYMMETRY ; ENERGIES ; DECAYS ; MASSES ; STATES
资助项目National Natural Science Foundation of China[11065001] ; Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences
WOS研究方向Physics
语种英语
出版者CHINESE PHYSICAL SOC
WOS记录号WOS:000706890200003
资助机构National Natural Science Foundation of China ; Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/125579]  
专题中国科学院合肥物质科学研究院
通讯作者Shui-Fa, Shen
作者单位1.Zhejiang Guangsha Vocat & Tech Univ Construct, Sch Intelligent Mfg, Jinhua 322100, Zhejiang, Peoples R China
2.Chinese Acad Sci, Inst Nucl Energy Safety Technol, Hefei Inst Phys Sci, Hefei 230031, Anhui, Peoples R China
3.Fujian Univ Technol, Sch Elect Elect Engn & Phys, Fuzhou 350118, Fujian, Peoples R China
4.Chinese Acad Sci, Inst Modern Phys, Key Lab High Precis Nucl Spect, Lanzhou 730000, Peoples R China
5.Zhengzhou Univ, Sch Phys, Zhengzhou 450001, Peoples R China
6.Suranaree Univ Technol, Sch Phys, Nakhon Ratchasima 30000, Thailand
7.Thailand Ctr Excellence Phys ThEP, Commiss Higher Educ, Bangkok 10400, Thailand
8.Hangzhou Normal Univ, Div Hlth Sci, Hangzhou 310012, Zhejiang, Peoples R China
9.Army Acad Artillery & Air Def, Dept Basic Sci, Hefei 230031, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Shui-Fa, Shen,Hua-Lei, Wang,Hai-Yan, Meng,et al. Possible triaxial deformation in N = Z nucleus germanium-64[J]. ACTA PHYSICA SINICA,2021,70.
APA Shui-Fa, Shen.,Hua-Lei, Wang.,Hai-Yan, Meng.,Yu-Peng, Yan.,Jie-Jie, Shen.,...&Li-Na, Bao.(2021).Possible triaxial deformation in N = Z nucleus germanium-64.ACTA PHYSICA SINICA,70.
MLA Shui-Fa, Shen,et al."Possible triaxial deformation in N = Z nucleus germanium-64".ACTA PHYSICA SINICA 70(2021).

入库方式： OAI收割

来源：合肥物质科学研究院

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