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Affiliation of Author(s):材料科学与技术学院

Journal:CHINESE PHYSICS C

Key Words:neutron-rich nuclei isomer high-order deformation moment of inertia odd-mass nuclei

Abstract:The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus Eu-163 are investigated by using the cranked shell model (CSM), with pairing treated by the particle-number conserving (PNC) method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in Eu-163. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state 13/2(-) (nu 7/2(+)[633]circle times nu 1/2(-)[521]circle times pi 5/2(+) [413]). More low-lying multi-particle states are predicted in Eu-163. Due to its significant effect on the nuclear mean field, the high-order epsilon(6) deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei Sm-162 and Gd-164, there is a 10%similar to 15% increase of J((1)) of the one-particle ground-state band in Eu-163. This is explained by the pairing reduction due to the blocking of the nucleon on the proton pi 5/2(+) [413] orbital in Eu-163.

ISSN No.:1674-1137

Translation or Not:no

Date of Publication:2019-06-01

Included Journals:SCI

Co-author:Chen, Ze-Long

Correspondence Author:hxt