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

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  • O. S. Kirsebom, Dalhousie Univ, Dalhousie University, Inst Big Data Analyt
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  • M. Hukkanen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • A. Kankainen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • W. H. Trzaska, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • D. F. Stroemberg, GSI Helmholtzzentrum Schwerionenforsch, GSI Helmholtz-Center for Heavy Ion Research, Helmholtz Association
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  • G. Martinez-Pined, GSI Helmholtzzentrum Schwerionenforsch, GSI Helmholtz-Center for Heavy Ion Research, Helmholtz Association
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  • K. Andersen
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  • E. Bodewits, SCIONIX Holland BV
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  • B. A. Brown, Michigan State Univ, Michigan State University, Natl Superconducting Cyclotron Lab
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  • L. Canete, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • J. Cederkall, Lund Univ, Lund University, Lund Observ, Dept Astron & Theoret Phys
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  • T. Enqvist, Univ Oulu, University of Oulu, Oulu Southern Inst
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  • T. Eronen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • H. O. U. Fynbo
  • S. Geldhof, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • R. de Groote, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • D. G. Jenkins, Univ York, University of York - UK, Dept Phys
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  • A. Jokinen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • P. Joshi, Univ York, University of York - UK, Dept Phys
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  • A. Khanam, Aalto Univ, Aalto University, Aalto Sci Inst
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  • J. Kostensalo, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • P. Kuusiniemi, Univ Oulu, University of Oulu, Oulu Southern Inst
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  • K. Langanke, Tech Univ Darmstadt, Darmstadt University of Technology, Inst Kernphys, Theoriezentrum, GSI Helmholtzzentrum Schwerionenforsch, GSI Helmholtz-Center for Heavy Ion Research, Helmholtz Association
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  • D Moore, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • M. Munch
  • D. A. Nesterenko, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • J. D. Ovejas, CSIC, CSIC - Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Cientificas (CSIC), Inst Estruct Mat
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  • H. Penalla, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • L. Pohjalainen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • M. Reponen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • S. Rinta-Antila, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • K. Riisager
  • A. de Roubin, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • P. Schotanus, SCIONIX Holland BV
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  • P. C. Srivastava, Indian Inst Technol, Indian Institute of Technology System (IIT System), Indian Institute of Technology (IIT) - Roorkee, Dept Phys
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  • J. Suhonen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • J. A. Swartz
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  • O. Tengblad, CSIC, CSIC - Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Cientificas (CSIC), Inst Estruct Mat
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  • M. Vilen, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys
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  • S. Vinals, CSIC, CSIC - Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Cientificas (CSIC), Inst Estruct Mat
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  • J. Aysto, Univ Jyvaskyla, University of Jyvaskyla, Dept Phys

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.

OriginalsprogEngelsk
Artikelnummer065805
TidsskriftPhysical Review C
Vol/bind100
Nummer6
Antal sider12
ISSN2469-9985
DOI
StatusUdgivet - 24 dec. 2019

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