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  • Letter
  • Open Access

Spectroscopy along flerovium decay chains. II. Fine structure in odd-A Fl289

D. M. Cox1,*, A. Såmark-Roth1, D. Rudolph1, L. G. Sarmiento1, R. M. Clark2, J. L. Egido3, P. Golubev1, J. Heery4,†, A. Yakushev5,6 et al.

S. Åberg1, H. M. Albers5, M. Albertsson1, M. Block5,6,7, H. Brand5, T. Calverley4, R. Cantemir5, B. G. Carlsson1, Ch. E. Düllmann5,6,7, J. Eberth8, C. Fahlander1, U. Forsberg1, J. M. Gates2, F. Giacoppo5,6, M. Götz5,6,7, S. Götz5,6,7, R.-D. Herzberg4, Y. Hrabar1, E. Jäger5, D. Judson4, J. Khuyagbaatar5,6, B. Kindler5, I. Kojouharov5, J. V. Kratz7, J. Krier5, N. Kurz5, L. Lens5,7,‡, J. Ljungberg1, B. Lommel5, J. Louko9, C.-C. Meyer6,7, A. Mistry10,5, C. Mokry6,7, P. Papadakis4,§, E. Parr5, J. L. Pore2, I. Ragnarsson1, J. Runke5,7, M. Schädel5, H. Schaffner5, B. Schausten5, D. A. Shaughnessy11, P. Thörle-Pospiech6,7, N. Trautmann7, and J. Uusitalo9

  • 1Department of Physics, Lund University, 22100 Lund, Sweden
  • 2Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Departamento de Física Teórica and CIAFF, Universidad Autónoma de Madrid, 28049 Madrid, Spain
  • 4Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 5GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 6Helmholtz Institute Mainz, 55099 Mainz, Germany
  • 7Department Chemie-Standort TRIGA, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
  • 8Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
  • 9Department of Physics, University of Jyväskylä, 40014 Jyväskylä, Finland
  • 10Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
  • 11Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA

  • *Corresponding author: danielcox404@gmail.com
  • †Present address: Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
  • ‡Present address: Institut für Physikalische Chemie und Radiochemie, Hochschule Mannheim, 68163 Mannheim, Germany.
  • §Present address: STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom.
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Phys. Rev. C 107, L021301 – Published 6 February, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.L021301

Abstract

Fifteen correlated α-decay chains starting from the odd-A superheavy nucleus Fl289 were observed following the fusion-evaporation reaction Ca48+Pu244. The results call for at least two parallel α-decay sequences starting from at least two different states of Fl289. 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 Cn285 and Ds281. 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.

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Physics Subject Headings (PhySH)

See Also

Spectroscopy along Flerovium Decay Chains: Discovery of Ds280 and an Excited State in Cn282

A. Såmark-Roth et al.
Phys. Rev. Lett. 126, 032503 (2021)

Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, Cn282, and spontaneous fission branches

A. Såmark-Roth et al.
Phys. Rev. C 107, 024301 (2023)

Article Text

Supplemental Material

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Phys. Rev. C 107, L021301– Published 6 February, 2023
  • Received 12 April 2022
  • Revised 1 September 2022
  • Accepted 16 December 2022
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