Single-particle and collective excitations in the N=28 isotones 54Fe and 53Mn

Research output: Contribution to journalArticle

Abstract

The fusion-evaporation reaction 32S + 28Si at 125 MeV beam energy was used to populate high-spin states in the semimagic N = 28 nuclei 53Mn and 54Fe. With a combination of the Gammasphere spectrometer and ancillary devices including the Microball CsI(Tl) array, extensive high-spin level schemes are derived. They exhibit rotational-like collective structures and competing single-particle excitations. The experimental results are compared with predictions from shell-model calculations, for which the inclusion of isopin-symmetry-breaking terms is found to improve the description. An interpretation of the high-spin states is put forward using cranked Nilsson-Strutinsky calculations, indicative of contributions from collective excitations beyond some 8-MeV excitation energy and highlighting the importance of the g9/2 intruder orbital in this energy range.

Details

Authors
Organisations
External organisations
  • Simon Fraser University
  • University of York
  • Washington University in St. Louis
  • Lawrence Berkeley National Laboratory
  • Malmö University
  • Argonne National Laboratory
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • Nuclear structure, Gamma-ray spectroscopy, Shell model calculations, Rotational bands
Original languageEnglish
Article number014316
Number of pages27
JournalPhysical Review C
Volume102
Issue number1
Publication statusPublished - 2020 Jul 21
Publication categoryResearch
Peer-reviewedYes

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