Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei

Research output: Contribution to journalArticle


Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 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 Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 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.


  • 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
  • GANIL Grand Accelerateur National d'Ions Lourds
  • 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
Original languageEnglish
Article number044307
Number of pages11
JournalPhysical Review C
Issue number4
StatePublished - 2018 Oct 9
Publication categoryResearch

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

Research output: Contribution to journalArticle

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Related projects

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

Knut and Alice Wallenberg Foundation, Nobelstiftelsen


Project: Research

Dirk Rudolph, Claes Fahlander, Pavel Golubev, Luis Sarmiento Pico, Anton Såmark-Roth, Christian Lorenz, Natasa Lalovic, Natasa Lalovic, Ulrika Forsberg, 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

Anton Såmark-Roth (Role not specified)
2018 May 9

Activity: Talk or presentationPresentation

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