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Measurement of the 2+0+ ground-state transition in the β decay of F20

O. S. Kirsebom et al.
Phys. Rev. C 100, 065805 – Published 24 December 2019
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Abstract

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)]×105 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.

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  • Received 15 August 2019
  • Corrected 4 March 2020

DOI:https://doi.org/10.1103/PhysRevC.100.065805

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Corrections

4 March 2020

Correction: The inadvertent omission of a marker indicating “Featured in Physics” in the PDF format has been fixed.

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A Forbidden Transition Allowed for Stars

Published 24 December 2019

The discovery of an exceptionally strong “forbidden” beta-decay involving fluorine and neon could change our understanding of the fate of intermediate-mass stars.

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See Also

Discovery of an Exceptionally Strong β-Decay Transition of F20 and Implications for the Fate of Intermediate-Mass Stars

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. Idini, 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, and J. Äystö
Phys. Rev. Lett. 123, 262701 (2019)

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Vol. 100, Iss. 6 — December 2019

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