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Spectroscopy along flerovium decay chains. II. Fine structure in odd-A 289Fl

Cox, D. M. LU ; Såmark-Roth, A. LU ; Rudolph, D. LU orcid ; Sarmiento, L. G. LU ; Clark, R. M. ; Egido, J. L. ; Golubev, P. LU ; Heery, J. ; Yakushev, A. and Åberg, S. LU , et al. (2023) In Physical Review C 107(2).
Abstract
Fifteen correlated α-decay chains starting from the odd-A superheavy nucleus 289Fl were observed following the fusion-evaporation reaction 48Ca+244Pu. The results call for at least two parallel α-decay sequences starting from at least two different states of 289Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed α-electron and α-photon coincidences, as well as the α-decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between 285Cn and 281Ds. Our experimental results, on the excited level structure of the heaviest odd-N nuclei to date,... (More)
Fifteen correlated α-decay chains starting from the odd-A superheavy nucleus 289Fl were observed following the fusion-evaporation reaction 48Ca+244Pu. The results call for at least two parallel α-decay sequences starting from at least two different states of 289Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed α-electron and α-photon coincidences, as well as the α-decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between 285Cn and 281Ds. Our experimental results, on the excited level structure of the heaviest odd-N nuclei to date, provide a direct testing ground for theory. This is illustrated by comparison with new nuclear structure calculations based on the symmetry-conserving configuration mixing theory. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Superheavy elements, Nuclear spectroscopy, Alpha decay, Mean field theory, Island of stability
in
Physical Review C
volume
107
issue
2
article number
L021301
pages
6 pages
publisher
American Physical Society
ISSN
2469-9985
DOI
10.1103/PhysRevC.107.L021301
project
Characterization of New Superheavy Elements
Nuclear Structure at the Limits: Isotope-selective Spectroscopy
Spectroscopy along Decay Chains of Element 114, Flerovium
language
English
LU publication?
yes
id
5ee9ca0f-3253-43e2-9534-f63589966e57
date added to LUP
2023-02-07 04:39:51
date last changed
2023-02-09 02:37:39
@article{5ee9ca0f-3253-43e2-9534-f63589966e57,
  abstract     = {{Fifteen correlated α-decay chains starting from the odd-<i>A</i> superheavy nucleus <sup>289</sup>Fl were observed following the fusion-evaporation reaction <sup>48</sup>Ca+<sup>244</sup>Pu. The results call for at least two parallel α-decay sequences starting from at least two different states of <sup>289</sup>Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed α-electron and α-photon coincidences, as well as the α-decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between <sup>285</sup>Cn and <sup>281</sup>Ds. Our experimental results, on the excited level structure of the heaviest odd-<i>N</i> nuclei to date, provide a direct testing ground for theory. This is illustrated by comparison with new nuclear structure calculations based on the symmetry-conserving configuration mixing theory.}},
  author       = {{Cox, D. M. and Såmark-Roth, A. and Rudolph, D. and Sarmiento, L. G. and Clark, R. M. and Egido, J. L. and Golubev, P. and Heery, J. and Yakushev, A. and Åberg, S. and Albers, H. M. and Albertsson, M. and Block, M. and Brand, H. and Calverley, T. and Cantemir, R. and Carlsson, B. G. and Düllmann, Ch. E. and Eberth, J. and Fahlander, C. and Forsberg, U. and Gates, J. M. and Giacoppo, F. and Götz, M. and Götz, S. and Herzberg, R.-D. and Hrabar, Y. and Jäger, E. and Judson, D. and Khuyagbaatar, J. and Kindler, B. and Kojouharov, I. and Kratz, J. V. and Krier, J. and Kurz, N. and Lens, L. and Ljungberg, J. and Lommel, B. and Louko, J. and Meyer, C.-C. and Mistry, A. and Mokry, C. and Papadakis, P. and Parr, E. and Pore, J. L. and Ragnarsson, I. and Runke, J. and Schädel, M. and Schaffner, H. and Schausten, B. and Shaughnessy, D. A. and Thörle-Pospiech, P. and Trautmann, N. and Uusitalo, J.}},
  issn         = {{2469-9985}},
  keywords     = {{Superheavy elements; Nuclear spectroscopy; Alpha decay; Mean field theory; Island of stability}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{2}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Spectroscopy along flerovium decay chains. II. Fine structure in odd-<i>A</i> <sup>289</sup>Fl}},
  url          = {{https://lup.lub.lu.se/search/files/136897865/PhysRevC.107.L021301.pdf}},
  doi          = {{10.1103/PhysRevC.107.L021301}},
  volume       = {{107}},
  year         = {{2023}},
}