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

Rudolph, D. LU ; Ragnarsson, I. LU ; Andreoiu, C. LU ; Bentley, M. A. ; Carpenter, M.P. ; Charity, R. J. ; Clark, R. M. ; Ekman, J. LU ; Fahlander, C. LU and Fallon, P. , et al. (2020) In Physical Review C 102(1).
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nuclear structure, Gamma-ray spectroscopy, Shell model calculations, Rotational bands
in
Physical Review C
volume
102
issue
1
article number
014316
pages
27 pages
publisher
American Physical Society
external identifiers
  • scopus:85089270939
ISSN
2469-9985
DOI
10.1103/PhysRevC.102.014316
project
Nuclear Structure at the Limits: Isotope-selective Spectroscopy
language
English
LU publication?
yes
id
7b2e6c7e-400b-4275-af23-1cb2e902a889
date added to LUP
2020-07-21 17:28:16
date last changed
2020-08-26 05:17:20
@article{7b2e6c7e-400b-4275-af23-1cb2e902a889,
  abstract     = {The fusion-evaporation reaction <sup>32</sup>S + <sup>28</sup>Si at 125 MeV beam energy was used to populate high-spin states in the semimagic <i>N</i> = 28 nuclei <sup>53</sup>Mn and <sup>54</sup>Fe. 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 <i>g</i>9/2 intruder orbital in this energy range.},
  author       = {Rudolph, D. and Ragnarsson, I. and Andreoiu, C. and Bentley, M. A. and Carpenter, M.P. and Charity, R. J. and Clark, R. M. and Ekman, J. and Fahlander, C. and Fallon, P. and Reviol, W. and Sarantites, D. G. and Seweryniak, D.},
  issn         = {2469-9985},
  language     = {eng},
  month        = {07},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review C},
  title        = {Single-particle and collective excitations in the <i>N</i>=28 isotones <sup>54</sup>Fe and <sup>53</sup>Mn},
  url          = {https://lup.lub.lu.se/search/ws/files/81904562/PhysRevC.102.014316.pdf},
  doi          = {10.1103/PhysRevC.102.014316},
  volume       = {102},
  year         = {2020},
}