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Measurement of the 2+→0+ ground-state transition in the β decay of F 20

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  • O. S. Kirsebom
  • M. Hukkanen
  • A. Kankainen
  • W. H. Trzaska
  • D. F. Strömberg
  • G. Martínez-Pinedo
  • K. Andersen
  • E. Bodewits
  • B. A. Brown
  • L. Canete
  • J. Cederkäll
  • T. Enqvist
  • T. Eronen
  • H. O.U. Fynbo
  • S. Geldhof
  • R. De Groote
  • A. Jokinen
  • A. Khanam
  • J. Kostensalo
  • P. Kuusiniemi
  • K. Langanke
  • I. Moore
  • M. Munch
  • D. A. Nesterenko
  • J. D. Ovejas
  • H. Penttilä
  • I. 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. Vínals
  • J. Aÿstö


Publication details

JournalPhysical Review C
DateAccepted/In press - 2 Nov 2019
DatePublished (current) - 24 Dec 2019
Issue number6
Original languageEnglish


We report the first detection of the second-forbidden, nonunique, 2+→0+, ground-state transition in the β decay of F20. A low-energy, mass-separated F+20 beam produced at the IGISOL facility in Jyväskylä, Finland, was implanted in a thin carbon foil and the β spectrum measured using a magnetic transporter and a plastic-scintillator detector. The β-decay branching ratio inferred from the measurement is bβ=[0.41±0.08(stat)±0.07(sys)]×10-5 corresponding to logft=10.89(11), making this one of the strongest second-forbidden, nonunique β 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 Ne20 is now known to within better than 25% at the relevant temperatures and densities.

Bibliographical note

©2019 American Physical Society.

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