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Evidence for prolate-oblate shape coexistence in the odd-ABr383573 nucleus

S. Bhattacharya1,2, T. Trivedi1,3,*, A. Mukherjee1, D. Negi4, R. P. Singh5, S. Muralithar5, S. Jehangir6, G. H. Bhat7,8, Nazira Nazir8 et al.

J. A. Sheikh8, N. Rather6, R. Palit4, S. Nag9, S. Rajbanshi10, S. Chakraborty11, S. Kumar12, M. Kumar Raju13, V. V. Parkar14, D. Choudhury15, R. Kumar5, R. K. Bhowmik5, S. C. Pancholi5, and A. K. Jain2

  • 1Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur-495009, India
  • 2Amity Institute of Nuclear Science and Technology, Amity University UP, Noida-201313, India
  • 3Department of Physics, University of Allahabad, Allahabad-211002, India
  • 4Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai-400005, India
  • 5Inter University Accelerator Centre, New Delhi-110067, India
  • 6Department of Physics, Islamic University of Science and Technology, Awantipora-192122, India
  • 7Department of Physics, Sri Pratap College, Srinagar-190001, India
  • 8Department of Physics, University of Kashmir, Srinagar-190001, India
  • 9Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
  • 10Department of Physics, Presidency University, Kolkata-700073, India
  • 11Variable Energy Cyclotron Centre, Kolkata-700064, India
  • 12Department of Physics and Astrophysics, University of Delhi, New Delhi-110007, India
  • 13Department of Physics, GITAM Institute of Science, Visakhapatnam-530045, India
  • 14Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • 15Department of Physics, Indian Institute of Technology, Ropar-140001, India

  • *Corresponding author: ttrivedi1@gmail.com
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Phys. Rev. C 106, 044312 – Published 14 October, 2022

DOI: https://doi.org/10.1103/PhysRevC.106.044312

Abstract

The excited states in Br73 nucleus have been investigated through the fusion evaporation reaction Cr50(Si28, αp)Br73 at a beam energy of 90 MeV using the Indian National Gamma Array. The γ−γ coincidence technique has been used to add eight new γ-ray transitions in the level scheme. The mixing ratio of ΔI=0 (mixed with E2 and M1) transitions have been determined using angular distribution and RDCO-polarization measurement. The half-life of the 9/2+ isomeric state has been measured to be τ1/2=52(2) ns from the variation in the intensity of delayed γ-ray transition as a function of coincidence time window. The two state mixing model calculations were performed to obtain the mixing amplitude, and mixing interaction of two different configurations of Br73. The calculated mixing amplitudes along with the deformations of two different configurations provide the monopole transition strength ρ2(E0) for Se, Br, and Kr isotopes in a semiempirical approach. These results support a prolate-oblate shape coexistence in the odd-ABr73 nucleus. The observed structural properties have been discussed in terms of projected shell model calculations.

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Outline

Information

Phys. Rev. C 106, 044312– Published 14 October, 2022
  • Received 29 November 2021
  • Revised 29 August 2022
  • Accepted 27 September 2022
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