Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


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 48Ca+242Pu and 48Ca+244Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to 286Fl and 288Fl, 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 282Cn. Spectroscopy of 288Fl decay chains fixed Qα=10.06(1) MeV. In one case, a Qα=9.46(1)-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286,288Fl, 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.


  • J. L. Egido
  • J.A.M. Heery
  • Alexander Yakushev
  • Helena M. Albers
  • M. Block
  • H. Brand
  • T. Calverley
  • R. Cantemir
  • Roderick M. Clark
  • Ch. E. Düllmann
  • J Eberth
  • Ulrika Forsberg
  • J. M. Gates
  • F. Giacoppo
  • Michael Götz
  • Stefan Götz
  • R.-D. Herzberg
  • E. Jäger
  • D. Judson
  • J. Khuyagbaatar
  • Birgit Kindler
  • I. Kojouharov
  • Jens-Volker Kratz
  • J. Krier
  • N. Kurz
  • L. Lens
  • Bettina Lommel
  • J. Louko
  • Carl-Christian Meyer
  • A. Mistry
  • C. Mokry
  • P. Papadakis
  • E. Parr
  • J. L. Pore
  • J. Runke
  • Matthias Schädel
  • H. Schaffner
  • B. Schausten
  • D. A. Shaughnessy
  • P. Thörle-Pospiech
  • N. Trautmann
  • J. Uusitalo
Enheter & grupper
Externa organisationer
  • Autonomous University of Madrid
  • GSI Helmholtz Centre for Heavy Ion Research
  • University of Mainz
  • Technical University of Darmstadt
  • University of Liverpool
  • Helmholtz Institute Mainz
  • Lawrence Berkeley National Laboratory
  • University of Cologne
  • University of Jyväskylä
  • Daresbury Laboratory
  • Lawrence Livermore National Laboratory

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik


Antal sidor7
TidskriftPhysical Review Letters
Utgåva nummer3
StatusPublished - 2021 jan 22
Peer review utfördJa


Ingen tillgänglig data

Relaterad forskningsoutput

Anton Såmark-Roth, 2021, Lund. 227 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

Anton Såmark-Roth, 2021, (Unpublished)

Forskningsoutput: Övriga bidragÖvrigt

U310 Collaboration at GSI/FAIR Phase-0 U310 Collaboration at GSI/FAIR Phase-0, 2020 dec 23, 2 uppl. Darmstadt: FAIR - Facility for Antiproton and Ion Research in Europe . 2 s. (NUSTAR Newsletters; vol. 2020, nr. 2)

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Related projects

Anton Såmark-Roth, Dirk Rudolph & Luis Sarmiento Pico


Projekt: AvhandlingIndividuellt forskningsprojekt, Internationellt samarbete

Dirk Rudolph, Sven Åberg, Gillis Carlsson, Christoph Emanuel Düllmann, Pavel Golubev, Luis Sarmiento Pico, Ulrika Forsberg, Jussi Toivanen, Daniel Ward, Daniel Cox, Christian Lorenz, Anton Såmark-Roth, Martin Albertsson, Jimmy Ljungberg, Yuliia Hrabar, Yulia Lindholm, Katarina Lindqvist & Mari Lundberg

Crafoordska stiftelsen, Knut and Alice Wallenberg Foundation, Nobelstiftelsen


Projekt: ForskningInternationellt samarbete

Dirk Rudolph, Claes Fahlander, Pavel Golubev, Luis Sarmiento Pico, Daniel Cox, Yuliia Hrabar, Anton Såmark-Roth, Ulrika Forsberg, Christian Lorenz, Natasa Lalovic, Natasa Lalovic, Ulrika Forsberg, Jnaneswari Gellanki, Robert Hoischen, Emma Johansson, Lise-Lotte Andersson, Rickard du Rietz, Jörgen Ekman & Corina Andreoiu

Swedish Research Council


Projekt: ForskningInternationellt samarbete

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Relaterade aktiviteter

Såmark-Roth, A. (intervjuad)
2021 apr

Aktivitet: AnnanFramträdande i media

Rudolph, D. (Inbjuden talare)
2020 nov 23

Aktivitet: Föredrag eller presentationInbjuden talare

Såmark-Roth, A. (Talare)
2019 okt 24

Aktivitet: Föredrag eller presentationPresentation

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