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

The fusion-evaporation reaction S 32+Si28 at 125 MeV beam energy was used to populate high-spin states in the semimagic N=28 nuclei Mn53 and Fe54 . With a combination of the Gammasphere spectrometer and ancillary devices including the Microball CsI(Tl) array, extensive high-spin level schemes are de...

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Veröffentlicht in:Physical review. C 2020-07, Vol.102 (1), Article 014316
Hauptverfasser: Rudolph, D., Ragnarsson, I., Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Ekman, J., Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., Seweryniak, D.
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Sprache:eng
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Zusammenfassung:The fusion-evaporation reaction S 32+Si28 at 125 MeV beam energy was used to populate high-spin states in the semimagic N=28 nuclei Mn53 and Fe54 . 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.
ISSN:2469-9985
0556-2813
1089-490X
2469-9993
DOI:10.1103/PhysRevC.102.014316