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

A. Såmark-Roth1,*, D. M. Cox1, D. Rudolph1, L. G. Sarmiento1, B. G. Carlsson1, J. L. Egido2, P. Golubev1, J. Heery3, A. Yakushev4 et al.

S. Åberg1, H. M. Albers4, M. Albertsson1, M. Block4,5,6, H. Brand4, T. Calverley3, R. Cantemir4, R. M. Clark7, Ch. E. Düllmann4,5,6, J. Eberth8, C. Fahlander1, U. Forsberg1, J. M. Gates7, F. Giacoppo4,5, M. Götz4,5,6, S. Götz4,5,6, R.-D. Herzberg3, Y. Hrabar1, E. Jäger4, D. Judson3, J. Khuyagbaatar4,5, B. Kindler4, I. Kojouharov4, J. V. Kratz6, J. Krier4, N. Kurz4, L. Lens4,6,†, J. Ljungberg1, B. Lommel4, J. Louko9, C.-C. Meyer5,6, A. Mistry10,4, C. Mokry5,6, P. Papadakis3,‡, E. Parr4, J. L. Pore7, I. Ragnarsson1, J. Runke4,6, M. Schädel4, H. Schaffner4, B. Schausten4, D. A. Shaughnessy11, P. Thörle-Pospiech5,6, N. Trautmann6, and J. Uusitalo9

  • 1Department of Physics, Lund University, 22100 Lund, Sweden
  • 2Departamento de Física Teórica and CIAFF, Universidad Autónoma de Madrid, 28049 Madrid, Spain
  • 3Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 5Helmholtz Institute Mainz, 55099 Mainz, Germany
  • 6Department Chemie–Standort TRIGA, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
  • 7Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 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

  • *Anton.Samark-Roth@nuclear.lu.se
  • †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. Lett. 126, 032503 – Published 22 January, 2021

DOI: https://doi.org/10.1103/PhysRevLett.126.032503

Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions Ca48+Pu242 and Ca48+Pu244 provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to Fl286 and Fl288, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely Cn282. Spectroscopy of Fl288 decay chains fixed Qα=10.06(1)  MeV. In one case, a Qα=9.46(1)-MeV decay from Cn284 into Ds280 was observed, with Ds280 fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of Fl286,288, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

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synopsis

An Octad for Darmstadtium and Excitement for Copernicium

Published 22 January, 2021

The discovery that copernicium can decay into a new isotope of darmstadtium and the observation of a previously unseen excited state of copernicium provide clues to the location of the “island of stability.”

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See Also

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)

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

D. M. Cox et al.
Phys. Rev. C 107, L021301 (2023)

Article Text

Supplemental Material

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Phys. Rev. Lett. 126, 032503– Published 22 January, 2021
  • Received 16 November 2020
  • Accepted 3 December 2020
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