Measurement of the 2(+) -> 0(+) ground-state transition in the beta decay of F-20

Research output: Contribution to journalArticleScientificpeer-review


  • O. S. Kirsebom
  • M. Hukkanen
  • A. Kankainen
  • W. H. Trzaska
  • D. F. Stroemberg
  • G. Martinez-Pined
  • K. Andersen
  • E. Bodewits
  • B. A. Brown
  • L. Canete
  • J. Cederkall
  • T. Enqvist
  • T. Eronen
  • H. O. U. Fynbo
  • S. Geldhof
  • R. de Groote
  • D. G. Jenkins
  • A. Jokinen
  • P. Joshi
  • J. Kostensalo
  • P. Kuusiniemi
  • K. Langanke
  • T.J.T. Moore
  • M. Munch
  • D. A. Nesterenko
  • J. D. Ovejas
  • H. Penalla
  • Tapio Pohjalainen
  • M. Reponen
  • S. Rinta-Antila
  • K. Riisager
  • A. de Roubin
  • P. Schotanus
  • P. C. Srivastava
  • J. Suhonen
  • J. A. Swartz
  • O. Tengblad
  • M. Vilen
  • S. Vinals
  • J. Aysto

Research units

  • Dalhousie Univ, Dalhousie University, Inst Big Data Analyt
  • Univ Jyvaskyla, University of Jyvaskyla, Dept Phys, Nanosci Ctr
  • GSI Helmholtzzentrum Schwerionenforsch, Helmholtz Association, GSI Helmholtz-Center for Heavy Ion Research
  • Aarhus University
  • SCIONIX Holland BV
  • Michigan State Univ, Michigan State University, Natl Superconducting Cyclotron Lab
  • Lund University
  • Univ Oulu, University of Oulu, Oulu Southern Inst
  • Univ York, University of York - UK, York Plasma Inst, Dept Phys
  • CSIC, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Instituto de Estructura de la Materia (IEM), Inst Estruct Mat
  • Indian Inst Technol, Indian Institute of Technology System (IIT System), Indian Institute of Technology (IIT) - Roorkee, Dept Phys


We report the first detection of the second-forbidden, nonunique, 2(+) -> 0(+), ground-state transition in the beta decay of F-20. A low-energy, mass-separated F-20(+) beam produced at the IGISOL facility in Jyvaskyla, Finland, was implanted in a thin carbon foil and the beta spectrum measured using a magnetic transporter and a plastic-scintillator detector. The beta-decay branching ratio inferred from the measurement is b(beta) = [0.41 +/- 0.08(stat) +/- 0.07(sys)] x 10(-5) corresponding to log ft = 10.89(11), making this one of the strongest second-forbidden, nonunique beta transitions ever measured. The experimental result is supported by shell-model calculations and has significant implications for the final evolution of stars that develop degenerate oxygen-neon cores. Using the new experimental data, we argue that the astrophysical electron-capture rate on Ne-20 is now known to within better than 25% at the relevant temperatures and densities.


Original languageEnglish
Article number065805
Pages (from-to)1-12
Number of pages12
Issue number6
Publication statusPublished - 24 Dec 2019
MoE publication typeA1 Journal article-refereed

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