Total Routhian surface calculations of triaxial or γ-soft propertiesin even-A N=76 isotones with 54≤Z≤68

YANG Qiong; WANG Hua-Lei; CHAI Qing-Zhen; LIU Min-Liang

doi:10.1088/1674-1137/39/9/094102

Chinese Physics C> 2015, Vol. 39> Issue(9) : 094102 DOI: 10.1088/1674-1137/39/9/094102

Total Routhian surface calculations of triaxial or γ-soft propertiesin even-A N=76 isotones with 54≤Z≤68

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Total Routhian surface (TRS) calculations for even-even N=76 isotones with 54≤Z≤68 have been performed in three-dimensional (β₂, γ, β₄) deformation space. Calculated results of the equilibrium deformations are presented and compared with other theoretical predictions and available experimental data. The behavior of collective angular momentum shows the neutron rotation-alignment is preferred in the lighter N=76 isotones, while for the heavier ones the proton alignment is favored. Moreover, multi-pair nucleon alignments and their competition (e.g., in ¹⁴⁴Er) are predicted. It is pointed out that these nuclei in the N=76 isotonic chain exhibit triaxiality or γ softness in high-spin states as well as ground states. Based on deformation-energy curves with respect to axial and non-axial quadrupole deformations, the shape instabilities are evaluated in detail and predicted, particularly in γ direction. Such instabilities are also supported by the odd- and even-spin level staggering of the observed γ bands, which is usually used to distinguish between γ-rigid and γ-soft asymmetry.

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YANG Qiong, WANG Hua-Lei, CHAI Qing-Zhen and LIU Min-Liang. Total Routhian surface calculations of triaxial or γ-soft propertiesin even-A N=76 isotones with 54≤Z≤68[J]. Chinese Physics C, 2015, 39(9): 094102. doi: 10.1088/1674-1137/39/9/094102

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Received: 2014-12-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Total Routhian surface calculations of triaxial or γ-soft propertiesin even-A N=76 isotones with 54≤Z≤68

Corresponding author: WANG Hua-Lei,

Received Date: 2014-12-16
Accepted Date: 1900-01-01
Available Online: 2015-09-05

Abstract: Total Routhian surface (TRS) calculations for even-even N=76 isotones with 54≤Z≤68 have been performed in three-dimensional (β₂, γ, β₄) deformation space. Calculated results of the equilibrium deformations are presented and compared with other theoretical predictions and available experimental data. The behavior of collective angular momentum shows the neutron rotation-alignment is preferred in the lighter N=76 isotones, while for the heavier ones the proton alignment is favored. Moreover, multi-pair nucleon alignments and their competition (e.g., in ¹⁴⁴Er) are predicted. It is pointed out that these nuclei in the N=76 isotonic chain exhibit triaxiality or γ softness in high-spin states as well as ground states. Based on deformation-energy curves with respect to axial and non-axial quadrupole deformations, the shape instabilities are evaluated in detail and predicted, particularly in γ direction. Such instabilities are also supported by the odd- and even-spin level staggering of the observed γ bands, which is usually used to distinguish between γ-rigid and γ-soft asymmetry.