Low-energy collective Gamow-Teller states and isoscalar pairing interaction

C. L. Bai, H. Sagawa, G. Colò, Y. Fujita, H. Q. Zhang, X. Z. Zhang, and F. R. Xu
Phys. Rev. C 90, 054335 – Published 26 November 2014

Abstract

The Gamow-Teller (GT) strength distributions and isobaric analog resonance (IAR) states of several N=Z+2 nuclei with mass number A=4258 are studied by using a self-consistent Skyrme Hartree-Fock-Bogoliubov method plus quasiparticle random phase approximation (HFB+QRPA) formalism. The isoscalar spin-triplet pairing interaction is included in QRPA on top of the isovector spin-singlet one in the HFB method. It is found that the isoscalar pairing correlations mix largely the (νj>πj<) configurations into the low-energy states, and this mixing plays an important role in the formation and in the collectivity of these low-energy states. Furthermore, the observed excitation energy of the low-energy GT state with respect to the IAR can be well reproduced when the strength of isoscalar pairing is about 1.01.05 times that of the isovector pairing, irrespective of the adopted Skyrme interactions. In N=Z+2 nuclei in the middle of the pf-shell, a mutual cooperative effect of isoscalar pairing and tensor interaction is found; namely, the tensor force reduces the spin-orbit splittings and enhances the effect of the isoscalar pairing.

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  • Received 5 July 2014
  • Revised 12 September 2014

DOI:https://doi.org/10.1103/PhysRevC.90.054335

©2014 American Physical Society

Authors & Affiliations

C. L. Bai1, H. Sagawa2,3, G. Colò4, Y. Fujita5,6, H. Q. Zhang7,8, X. Z. Zhang7, and F. R. Xu8

  • 1School of Physical Science and Technology, Sichuan University, Chengdu 610065, China
  • 2Center for Mathematics and Physics, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8560, Japan
  • 3RIKEN, Nishina Center, Wako 351-0198, Japan
  • 4Dipartimento di Fisica, Università degli Studi di Milano and INFN, Sezione di Milano, 20133 Milano, Italy
  • 5Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 6Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 7China Institute of Atomic Energy, Beijing 102413, China
  • 8School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, China

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Issue

Vol. 90, Iss. 5 — November 2014

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