Absence of paired crossing in the positive parity bands of Cs124

A. K. Singh, A. Basu, Somnath Nag, H. Hübel, J. Domscheit, I. Ragnarsson, A. Al-Khatib, G. B. Hagemann, B. Herskind, D. R. Elema, J. N. Wilson, R. M. Clark, M. Cromaz, P. Fallon, A. Görgen, I.-Y. Lee, D. Ward, and W. C. Ma
Phys. Rev. C 97, 024323 – Published 20 February 2018

Abstract

High-spin states in Cs124 were populated in the Ni64(Ni64,p3n) reaction and the Gammasphere detector array was used to measure γ-ray coincidences. Both positive- and negative-parity bands, including bands with chiral configurations, have been extended to higher spin, where a shape change has been observed. The configurations of the bands before and after the alignment are discussed within the framework of the cranked Nilsson-Strutinsky model. The calculations suggest that the nucleus undergoes a shape transition from triaxial to prolate around spin I22 of the positive-parity states. The alignment gain of 8, observed in the positive-parity bands, is due to partial alignment of several valence nucleons. This indicates the absence of band crossing due to paired nucleons in the bands.

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  • Received 18 December 2017

DOI:https://doi.org/10.1103/PhysRevC.97.024323

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. K. Singh and A. Basu

  • Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India

Somnath Nag*

  • Department of Physics, National Institute of Technology Raipur, GE Road, Raipur 492010, India

H. Hübel and J. Domscheit

  • Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany

I. Ragnarsson

  • Division of Mathematical Physics, LTH, Lund University, P.O. Box 118, SE-22100 Lund, Sweden

A. Al-Khatib

  • Department of Physics, Faculty of Science, University of Damascus, Damascus, Syria

G. B. Hagemann, B. Herskind, D. R. Elema, and J. N. Wilson

  • Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

R. M. Clark, M. Cromaz, P. Fallon, A. Görgen§, I.-Y. Lee, and D. Ward

  • Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

W. C. Ma

  • Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762, USA

  • *Present address: Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, Uttar Pradesh, India.
  • Present address: SCK·CEN, BE-2400 Mol, Belgium.
  • Present address: IPN, F-91406 Orsay, France.
  • §Present address: Department of Physics, University of Oslo, N-0316 Oslo, Norway.

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Issue

Vol. 97, Iss. 2 — February 2018

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