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Single-particle and collective excitations in the N=28 isotones 54Fe and 53Mn
- Source :
- Physical Review C; 102(1), no 014316 (2020)
- Publication Year :
- 2020
- Publisher :
- American Physical Society, 2020.
-
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
- Language :
- English
- ISSN :
- 24699985
- Database :
- OpenAIRE
- Journal :
- Physical Review C; 102(1), no 014316 (2020)
- Accession number :
- edsair.od......1110..29a3c22f5bd28f8ec8da6d9bec328149