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Spectroscopy along flerovium decay chains. II : Fine structure in odd-A289Fl

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, 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.

Main Authors

Cox, D. M. Såmark-Roth, A. Rudolph, D. Sarmiento, L. G. Clark, R. M. Egido, J. L. Golubev, P. Heery, J. Yakushev, A. Åberg, S. Albers, H. M. Albertsson, M. Block, M. Brand, H. Calverley, T. Cantemir, R. Carlsson, B. G. Düllmann, Ch. E. Eberth, J. Fahlander, C. Forsberg, U. Gates, J. M. Giacoppo, F. Götz, M. Götz, S. Herzberg, R.-D. Hrabar, Y. Jäger, E. Judson, D. Khuyagbaatar, J. Kindler, B. Kojouharov, I. Kratz, J. V. Krier, J. Kurz, N. Lens, L. Ljungberg, J. Lommel, B. Louko, J. Meyer, C.-C. Mistry, A. Mokry, C. Papadakis, P. Parr, E. Pore, J. L. Ragnarsson, I. Runke, J. Schädel, M. Schaffner, H. Schausten, B. Shaughnessy, D. A. Thörle-Pospiech, P. Trautmann, N. Uusitalo, J.

Format

Articles Research article

Published

2023

Series

Physical Review C

Subjects

ydinfysiikka

Publication in research information system

https://converis.jyu.fi/converis/portal/detail/Publication/182675166

Publisher

American Physical Society (APS)

The permanent address of the publication

https://urn.fi/URN:NBN:fi:jyu-202304062440Use this for linking

Review status

Peer reviewed

ISSN

2469-9985

DOI

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

Language

English

Published in

Physical Review C

Citation

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L. G., Clark, R. M., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Carlsson, B. G., Düllmann, C. E., Eberth, J., . . . Uusitalo, J. (2023). Spectroscopy along flerovium decay chains. II : Fine structure in odd-A289Fl. Physical Review C, 107(2), Article L021301. https://doi.org/10.1103/PhysRevC.107.L021301

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Funder(s)

European Commission

Funding program(s)

Research infrastructures, H2020

Additional information about funding

The results presented here are based on the experiment U310, which was performed at the beam line X8/TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany) in the frame of FAIR Phase-0. The authors would like to thank the ion-source and accelerator staff at GSI for their supreme efforts. This work has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 654002 (ENSAR2). The 244Pu target material was provided by the U.S. DOE through ORNL. The Lund group is indebted to decisive support from the Knut and Alice Wallenberg foundation (KAW 2015.0021), and we highly appreciate the possibility to collaborate with the workshops at IKP Köln. This work was also supported by the Swedish Research Council (Vetenskapsrådet, VR 2016-3969), the Royal Physiographic Society in Lund, the Spanish Ministerio de Ciencia e Inovación under Contract No. PID2020-118265GB-C41, the German BMBF (05P18UMFN2), the U.S. DOE under Contract No. DE-AC02-05CH11231 (LBNL), and the UK STFC.

Spectroscopy along flerovium decay chains. II : Fine structure in odd-A289Fl

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