Measurement of the 2+→0+ ground-state transition in the β decay of F 20
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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12
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Physical Review C, Volume 100, issue 6, pp. 1-12
Abstract
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.Description
| openaire: EC/H2020/654002/EU//ENSAR2
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Kirsebom, O S, Hukkanen, M, Kankainen, A, Trzaska, W H, Stroemberg, D F, Martinez-Pined, G, Andersen, K, Bodewits, E, Brown, B A, Canete, L, Cederkall, 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, T, Reponen, M, Rinta-Antila, S, Riisager, K, de Roubin, A, Schotanus, P, Srivastava, P C, Suhonen, J, Swartz, J A, Tengblad, O, Vilen, M, Vinals, S & Aysto, J 2019, 'Measurement of the 2+→0+ ground-state transition in the β decay of F 20', Physical Review C, vol. 100, no. 6, 065805, pp. 1-12. https://doi.org/10.1103/PhysRevC.100.065805, https://doi.org/10.1103/PhysRevC.100.065805, https://doi.org/https://converis.jyu.fi/converis/portal/detail/Publication/34168839?lang=en_GB