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

AuthorsKirsebom, O.S.; Hukkanen, M.; Kankainen, A.; Trzaska, W.H.; Strömberg, D.F.; Martínez-Pinedo, G.; Andersen, K.; Bodewits, E.; Brown, B.A.; Canete, L.; Cederkäll, J.; Enqvist, T.; Eronen, T.; Fynbo, H.O.U.; Geldhof, S.; de Groote, R.; Jenkins, D.G.; Jokinen, A.; Joshi, P.; Khanam, A.; Kostensalo, J.; Kuusiniemi, P.; Langanke, K.; Moore, I.; Munch, M.; Nesterenko, D.A.; Ovejas, J. D.; Penttilä, H.; Pohjalainen, I.; Reponen, M.; Rinta-Antila, S.; Riisager; K.; de Roubin, A.; Schotanus, P.; Srivastava, P.C.; Suhonen, J.; Swartz, J.A.; Tengblad, Olof ; Vilen, M.; Víñals, S.; Äystö, J.
Issue Date4-Mar-2020
PublisherAmerican Physical Society
CitationPhysical Review C 100: 065805 (2019)
AbstractWe report the first detection of the second-forbidden, nonunique, 2+ → 0+, ground-state transition in the β decay of 20F. A low-energy, mass-separated 20F+ 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 plasticscintillator detector. The β-decay branching ratio inferred from the measurement is bβ = [0.41 ± 0.08(stat) ± 0.07(sys)] × 10−5 corresponding to log f t = 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 20Ne is now known to within better than 25% at the relevant temperatures and densities
Description12 pags., 16 figs., 4 tabs.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.100.065805
Identifiersdoi: 10.1103/PhysRevC.100.065805
issn: 2469-9985
Appears in Collections:(CFMAC-IEM) Artículos
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