Discovery of an Exceptionally Strong β -Decay Transition of F 20 and Implications for the Fate of Intermediate-Mass Stars

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


A significant fraction of stars between 7 and 11 solar masses are thought to become supernovae, but the explosion mechanism is unclear. The answer depends critically on the rate of electron capture on Ne20 in the degenerate oxygen-neon stellar core. However, because of the unknown strength of the transition between the ground states of Ne20 and F20, it has not previously been possible to fully constrain the rate. By measuring the transition, we establish that its strength is exceptionally large and that it enhances the capture rate by several orders of magnitude. This has a decisive impact on the evolution of the core, increasing the likelihood that the star is (partially) disrupted by a thermonuclear explosion rather than collapsing to form a neutron star. Importantly, our measurement resolves the last remaining nuclear physics uncertainty in the final evolution of degenerate oxygen-neon stellar cores, allowing future studies to address the critical role of convection, which at present is poorly understood


  • O. S. Kirsebom
  • S. Jones
  • D. F. Strömberg
  • G. Martínez-Pinedo
  • K. Langanke
  • F. K. Röpke
  • B. A. Brown
  • T. Eronen
  • H. O.U. Fynbo
  • M. Hukkanen
  • A. Jokinen
  • A. Kankainen
  • J. Kostensalo
  • I. Moore
  • H. Möller
  • S. T. Ohlmann
  • H. Penttilä
  • K. Riisager
  • S. Rinta-Antila
  • P. C. Srivastava
  • J. Suhonen
  • W. H. Trzaska
  • J. Äystö
Enheter & grupper
Externa organisationer
  • Aarhus University
  • Dalhousie University
  • Los Alamos National Laboratory
  • Heidelberg Institute for Theoretical Studies
  • Technical University of Darmstadt
  • GSI Helmholtz Centre for Heavy Ion Research
  • Heidelberg University
  • Michigan State University
  • University of Jyväskylä
  • Max Planck Computing and Data Facility
  • Indian Institute of Technology, Roorkee

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Den kondenserade materiens fysik
TidskriftPhysical Review Letters
Utgåva nummer26
StatusPublished - 2019 dec 24
Peer review utfördJa