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High-spin states in 212Po above the α-decaying (18+) isomer

Zago, L. ; Gottardo, A. ; Valiente-Dobón, J. J. ; Benzoni, G. ; Gadea, A. ; Górska, M. ; Lunardi, S. ; Podolyák, Zs. ; Regan, P. H. and Rudolph, D. LU orcid , et al. (2022) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 834.
Abstract

The nucleus 212Po has been produced through the fragmentation of a 238U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21− isomeric state feeding the α-emitting 45-s (18+) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23+ metastable state. These are the first observations of high-spin states above the 212Po (18+) isomer, by virtue of the selectivity obtained via ion-by-ion identification of 238U... (More)

The nucleus 212Po has been produced through the fragmentation of a 238U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21− isomeric state feeding the α-emitting 45-s (18+) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23+ metastable state. These are the first observations of high-spin states above the 212Po (18+) isomer, by virtue of the selectivity obtained via ion-by-ion identification of 238U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼100 is sensitive.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
γ spectroscopy, Isomer spectroscopy, High-spin spectroscopy
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
834
article number
137457
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:85138786400
ISSN
0370-2693
DOI
10.1016/j.physletb.2022.137457
project
Nuclear Structure at the Limits: Isotope-selective Spectroscopy
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 The Authors
id
227fecd8-59d0-40fd-95ff-ff4342413625
date added to LUP
2022-10-24 20:10:38
date last changed
2023-12-05 10:38:08
@article{227fecd8-59d0-40fd-95ff-ff4342413625,
  abstract     = {{<p>The nucleus <sup>212</sup>Po has been produced through the fragmentation of a <sup>238</sup>U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21<sup>−</sup> isomeric state feeding the α-emitting 45-s (18<sup>+</sup>) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23<sup>+</sup> metastable state. These are the first observations of high-spin states above the <sup>212</sup>Po (18<sup>+</sup>) isomer, by virtue of the selectivity obtained via ion-by-ion identification of <sup>238</sup>U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼100 is sensitive.</p>}},
  author       = {{Zago, L. and Gottardo, A. and Valiente-Dobón, J. J. and Benzoni, G. and Gadea, A. and Górska, M. and Lunardi, S. and Podolyák, Zs. and Regan, P. H. and Rudolph, D. and Algora, A. and de Angelis, G. and Bazzacco, D. and Benlliure, J. and Boutachkov, P. and Bracco, A. and Bruce, A. M. and Camera, F. and Casarejos, E. and Cortés, M. L. and Crespi, F. C. L. and Corsi, A. and Domingo-Pardo, C. and Doncel, M. and Engert, T. and Geissel, H. and Gerl, J. and Goasduff, A. and Goel, N. and Grebosz, J. and Gregor, E. and Habermann, T. and Klupp, S. and Kojouharov, I. and Kurz, N. and Lenzi, S. M. and Leoni, S. and Mandal, S. and Menegazzo, R. and Mengoni, D. and Million, B. and Morales, A. I. and Napoli, D. R. and Naqvi, F. and Nociforo, C. and Pfützner, M. and Pietri, S. and Prochazka, A. and Recchia, F. and Sahin, E. and Schaffner, H. and Sharma, A. and Sitar, B. and Siwal, D. and Strmen, P. and Szarka, I. and Ur, C. A. and Walker, P. M. and Weick, H. and Wieland, O. and Wollersheim, H.-J.}},
  issn         = {{0370-2693}},
  keywords     = {{γ spectroscopy; Isomer spectroscopy; High-spin spectroscopy}},
  language     = {{eng}},
  month        = {{11}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{High-spin states in <sup>212</sup>Po above the α-decaying (18<sup>+</sup>) isomer}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2022.137457}},
  doi          = {{10.1016/j.physletb.2022.137457}},
  volume       = {{834}},
  year         = {{2022}},
}