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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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 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.

Detaljer

Författare
  • 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
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik

Nyckelord

Originalspråkengelska
Artikelnummer032503
Antal sidor7
TidskriftPhysical Review Letters
Volym126
Utgåva nummer3
StatusPublished - 2021 jan 22
PublikationskategoriForskning
Peer review utfördJa

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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)

Forskningsoutput: Bok/rapportRapport

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Relaterade aktiviteter

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Aktivitet: AnnanFramträdande i media

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Aktivitet: Föredrag eller presentationInbjuden talare

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