Neutron-proton pairing correlations and deformation for N=Z nuclei in the pf shell within the deformed BCS and Hartree-Fock-Bogoliubov approach

Eunja Ha, Myung-Ki Cheoun, H. Sagawa, and W. Y. So
Phys. Rev. C 97, 064322 – Published 29 June 2018

Abstract

We investigated neutron-proton pairing correlations effects on the shell evolution of ground-state energies by the deformation for N=Z nuclei in pf shell, such as Ti44, Cr48, Fe52, Ge64, Se68, Kr72, and Sr76. We started from a simple shell-filling model constructed by a deformed Woods-Saxon potential with β2 deformation, and included pairing correlations in the residual interaction, which give rise to smearing of the Fermi surface revealing interesting evolution of the Fermi energy along the shell evolution. In this work, like-pairing and unlike-pairing correlations decomposed as isovector T=1 and isoscalar T=0 components are explicitly taken into account. Finally, we estimate ground-state energies comprising the mean-field energy, the pairing energy, and the self-energy due to the pairing correlations, in terms of the deformation. The enhanced T=0 pairing interaction supports oblate deformations for Kr72 and Se68, whose features are different from other pf-shell N=Z nuclei considered in this work.

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  • Received 2 March 2018
  • Revised 12 May 2018

DOI:https://doi.org/10.1103/PhysRevC.97.064322

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Eunja Ha* and Myung-Ki Cheoun

  • Department of Physics and Origin of Matter and Evolution of Galaxy (OMEG) Institute, Soongsil University, Seoul 156-743, Korea

H. Sagawa

  • RIKEN, Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan and Center for Mathematics and Physics, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8560, Japan

W. Y. So

  • Department of Radiological Science, Kangwon National University at Dogye, Samcheok 245-905, Korea

  • *ejha@ssu.ac.kr
  • Corresponding author: cheoun@ssu.ac.kr
  • sagawa@ribf.riken.jp

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Issue

Vol. 97, Iss. 6 — June 2018

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