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

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.

doi:10.1103/PhysRevC.102.014316

Title: Single-particle and collective excitations in the $N = 28$ isotones ${}^{54}{Fe}$ and ${}^{53}{Mn}$

Journal Article · Tue Jul 21 00:00:00 EDT 2020 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.102.014316· OSTI ID:1640264

;

; Andreoiu, C.; Bentley, M. A.; Carpenter, M. P.;

; Clark, R. M.; Ekman, J.;

; Fallon, P.;

; Sarantites, D. G.; Seweryniak, D.

The fusion-evaporation reaction ${}_{32}S + {}_{28}{Si}$ at 125 MeV beam energy was used to populate high-spin states in the semimagic $N = 28$ nuclei ${}_{53}{Mn}$ and ${}_{54}{Fe}$ . 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 $g_{9 / 2}$ intruder orbital in this energy range.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Swedish Research Council (VR)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; FG05-88ER-40406

OSTI ID:: 1640264

Alternate ID(s):: OSTI ID: 1706104

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Vol. 102 Journal Issue: 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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

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Title: Single-particle and collective excitations in the $N = 28$ isotones ${}^{54}{Fe}$ and ${}^{53}{Mn}$