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Title: Changes of deformed shell gaps at N ~ 100 in light rare-earth, neutron-rich nuclei

Abstract

There have been compelling evidences indicating that deformed single-particle states in neutron- rich regions are different from those in the stable region. It was pointed out that for the light rare- earth (60Nd, 62Sm, and 64Gd), neutron-rich (N = 98-102) nuclei, the Woods-Saxon potential, the Nilsson modified oscillator potential with "universal" parameters, and the folded Yukawa potential all failed to describe the correct ordering of neutron single-particle states. The location and size of deformed shell gaps in this mass region are under current debate. We propose a modification for the "standard" Nilsson parameters of Bengtsson and Ragnarsson introduced in 1985. The proposed N-dependent spin-orbit interaction brings an effect of the tensor force for the deformed potential, which causes dynamic changes in deformed shell gaps with neutron number and deformation. By applying the modified Nilsson parameters to generate deformed bases for the Projected Shell Model, we demonstrate that the calculation can explain consistently the current experimental data, including the ground state configuration in odd-neutron nuclei, upbending of the yrast moment of inertia at higher spins and the energies of 2-quasineutron 6- and 4- isomers in even-even nuclei.

Authors:
 [1];  [2]; ORCiD logo [3];  [4]
  1. Huzhou Univ. (China)
  2. Shanghai Jiao Tong Univ. (China)
  3. Shanghai Jiao Tong Univ. (China); Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Modern Physics; China Inst. of Atomic Energy (CIAE), Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1616694
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. G, Nuclear and Particle Physics
Additional Journal Information:
Journal Volume: 47; Journal Issue: 5; Journal ID: ISSN 0954-3899
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nilsson model; projected shell model; deformed shell gap; deformed single-particle state; neutron-rich nuclei; spin-orbit interaction

Citation Formats

Liu, Yan-Xin, Lv, Cui-Juan, Sun, Yang, and Kondev, Filip G. Changes of deformed shell gaps at N ~ 100 in light rare-earth, neutron-rich nuclei. United States: N. p., 2020. Web. doi:10.1088/1361-6471/ab752d.
Liu, Yan-Xin, Lv, Cui-Juan, Sun, Yang, & Kondev, Filip G. Changes of deformed shell gaps at N ~ 100 in light rare-earth, neutron-rich nuclei. United States. doi:https://doi.org/10.1088/1361-6471/ab752d
Liu, Yan-Xin, Lv, Cui-Juan, Sun, Yang, and Kondev, Filip G. Thu . "Changes of deformed shell gaps at N ~ 100 in light rare-earth, neutron-rich nuclei". United States. doi:https://doi.org/10.1088/1361-6471/ab752d. https://www.osti.gov/servlets/purl/1616694.
@article{osti_1616694,
title = {Changes of deformed shell gaps at N ~ 100 in light rare-earth, neutron-rich nuclei},
author = {Liu, Yan-Xin and Lv, Cui-Juan and Sun, Yang and Kondev, Filip G.},
abstractNote = {There have been compelling evidences indicating that deformed single-particle states in neutron- rich regions are different from those in the stable region. It was pointed out that for the light rare- earth (60Nd, 62Sm, and 64Gd), neutron-rich (N = 98-102) nuclei, the Woods-Saxon potential, the Nilsson modified oscillator potential with "universal" parameters, and the folded Yukawa potential all failed to describe the correct ordering of neutron single-particle states. The location and size of deformed shell gaps in this mass region are under current debate. We propose a modification for the "standard" Nilsson parameters of Bengtsson and Ragnarsson introduced in 1985. The proposed N-dependent spin-orbit interaction brings an effect of the tensor force for the deformed potential, which causes dynamic changes in deformed shell gaps with neutron number and deformation. By applying the modified Nilsson parameters to generate deformed bases for the Projected Shell Model, we demonstrate that the calculation can explain consistently the current experimental data, including the ground state configuration in odd-neutron nuclei, upbending of the yrast moment of inertia at higher spins and the energies of 2-quasineutron 6- and 4- isomers in even-even nuclei.},
doi = {10.1088/1361-6471/ab752d},
journal = {Journal of Physics. G, Nuclear and Particle Physics},
number = 5,
volume = 47,
place = {United States},
year = {2020},
month = {3}
}

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