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

D. Rudolph, I. Ragnarsson, C. Andreoiu, M. A. Bentley, M.P. Carpenter, R. J. Charity, R. M. Clark, J. Ekman, C. Fahlander, P. Fallon, W. Reviol, D. G. Sarantites, D. Seweryniak

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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.
Original languageEnglish
Article number014316
Number of pages27
JournalPhysical Review C
Volume102
Issue number1
DOIs
Publication statusPublished - 2020 Jul 21

Subject classification (UKÄ)

  • Subatomic Physics

Keywords

  • Nuclear structure
  • Gamma-ray spectroscopy
  • Shell model calculations
  • Rotational bands

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