Low-lying states in 219Ra and 215Rn: Sampling microsecond α-decaying nuclei

Research output: Contribution to journalArticle


Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.


  • U. Forsberg
  • D. Ackermann
  • L. L. Andersson
  • M. Block
  • H. Brand
  • A. Di Nitto
  • Ch E. Düllmann
  • K. Eberhardt
  • J. Even
  • J. M. Gates
  • J. Gerl
  • K. E. Gregorich
  • C. J. Gross
  • R. D. Herzberg
  • F. P. Heßberger
  • E. Jäger
  • J. Khuyagbaatar
  • B. Kindler
  • I. Kojouharov
  • J. V. Kratz
  • J. Krier
  • N. Kurz
  • B. Lommel
  • A. Mistry
  • C. Mokry
  • J. P. Omtvedt
  • P. Papadakis
  • J. Runke
  • K. Rykaczewski
  • M. Schädel
  • H. Schaffner
  • B. Schausten
  • P. Thörle-Pospiech
  • N. Trautmann
  • T. Torres
  • A. Türler
  • A. Ward
  • N. Wiehl
  • A. Yakushev
External organisations
  • GSI Helmholtz Centre for Heavy Ion Research
  • National Large Heavy Ion Accelerator (GANIL)
  • Helmholtz Institute Mainz
  • University of Mainz
  • University of Liverpool
  • Lawrence Berkeley National Laboratory
  • Oak Ridge National Laboratory
  • University of Oslo
  • University of Bern
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • alpha decay, half life, gamma-ray spectroscopy, pulse shape analysis, nuclear shell model, Nilsson-Strutinsky calculations
Original languageEnglish
Article number044307
Number of pages11
JournalPhysical Review C
Issue number4
Publication statusPublished - 2018 Oct 9
Publication categoryResearch

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Related research output

Anton Såmark-Roth, 2021, Lund. 227 p.

Research output: ThesisDoctoral Thesis (compilation)

J. Khuyagbaatar, A. Yakushev, Ch. E. Düllmann, D. Ackermann, L.-L. Andersson, M. Block, H. Brand, D. M. Cox, J. Even, Ulrika Forsberg, Pavel Golubev, W. Hartmann, R.-D. Herzberg, F. P. Heßberger, J. Hoffmann, A. Hübner, E. Jäger, J. Jeppsson, B. Kindler, J. V. Kratz & 19 others, J. Krier, N. Kurz, B. Lommel, M. Maiti, S. Minami, A. K. Mistry, Ch. M. Mrosek, I. Pysmenetska, Dirk Rudolph, Luis Sarmiento, H. Schaffner, M. Schädel, B. Schausten, J. Steiner, T. Torres De Heidenreich, J. Uusitalo, M. Wegrzecki, N. Wiehl & V. Yakusheva, 2015, In: Physical Review Letters. 115, 24, 4 p., 242502.

Research output: Contribution to journalArticle

Dirk Rudolph, Ulrika Forsberg, Pavel Golubev, Luis Sarmiento, A. Yakushev, L.-L. Andersson, A. Di Nitto, Ch.E. Düllmann, J.M. Gates, K.E. Gregorich, C.J. Gross, F.P. Heßberger, R.-D. Herzberg, J. Khuyagbaatar, J.V. Kratz, K. Rykaczewski, M. Schädel, Sven Åberg, D. Ackermann, M. Block & 31 others, H. Brand, Gillis Carlsson, D. Cox, X. Derkx, K. Eberhardt, J. Even, Claes Fahlander, J. Gerl, E. Jäger, B. Kindler, J. Krier, I. Kojouharov, N. Kurz, B. Lommel, A. Mistry, C. Mokry, H. Nitsche, J.P. Omtvedt, P. Papadakis, Ingemar Ragnarsson, J. Runke, H. Schaffner, B. Schausten, P. Thörle-Pospiech, T. Torres, T. Traut, N. Trautmann, A. Türler, A. Ward, Daniel Ward & N. Wiehl, 2013, In: Physical Review Letters. 111, 11, 112502.

Research output: Contribution to journalArticle

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Related projects

Anton Såmark-Roth, Dirk Rudolph & Luis Sarmiento Pico


Project: DissertationIndividual research project, International collaboration

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

Crafoord Foundation, Knut and Alice Wallenberg Foundation, The Nobel Foundation


Project: ResearchInternational collaboration

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


Project: ResearchInternational collaboration

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Related activities

Såmark-Roth, A. (Speaker)
2018 Sep 25

Activity: Talk or presentationPresentation

Såmark-Roth, A. (Role not specified)
2018 May 9

Activity: Talk or presentationPresentation

Såmark-Roth, A. (Role not specified)
2017 Oct 10

Activity: Talk or presentationPresentation

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