Evolution of collectivity and evidence of octupole correlations in Br 73

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Abstract

High-spin states in the Br73 nucleus have been populated via the Cr50(Si28,αp)Br73 fusion evaporation reaction with a beam energy of 90 MeV. The deexciting gamma rays were detected using the Indian National Gamma Array (INGA). Using the γ-γ coincidence technique, two new bands and eight new interconnecting transitions have been added. The strong interconnecting E1 transitions, between positive and negative parity bands, ensure the existence of octupole correlations at low spin. Line shapes have been observed for 17 transitions, which were analyzed by the Doppler-shift attenuation method to determine the lifetime of excited states of the yrast negative parity band and its signature partner band along with the positive parity band. The deduced transitional quadrupole moments Qt for the ground state band decrease with increasing spin, with their values ranging from 2.88 to 1.00 eb. A similar trend in the quadrupole moment has also been observed for the signature partner as well as for the positive parity band. This decrease in Qt with increasing spin for these bands is interpreted in terms of the cranked Nilsson-Strutinsky model and total Routhian surface calculations, which indicate possible band termination at higher spin.

Detaljer

Författare
  • S. Bhattacharya
  • T. Trivedi
  • D. Negi
  • R. P. Singh
  • S. Muralithar
  • R. Palit
  • I. Ragnarsson
  • S. Nag
  • S. Rajbanshi
  • M. Kumar Raju
  • V. V. Parkar
  • G. Mohanto
  • S. Kumar
  • D. Choudhury
  • R. Kumar
  • R. K. Bhowmik
  • S. C. Pancholi
  • A. K. Jain
Enheter & grupper
Externa organisationer
  • Inter University Accelerator Centre India
  • Tata Institute of Fundamental Research
  • Osaka University
  • Bhabha Atomic Research Centre
  • University of Delhi
  • Guru Ghasidas Vishwavidyalaya University
  • Centre for Excellence in Basic Sciences
  • Banaras Hindu University
  • Presidency University, Kolkata
  • Indian Institute of Technology
  • Amity University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Originalspråkengelska
Artikelnummer014315
TidskriftPhysical Review C
Volym100
Utgåva nummer1
StatusPublished - 2019 jul 22
PublikationskategoriForskning
Peer review utfördJa