First Accurate Normalization of the β -delayed α Decay of 16N and Implications for the 12C (α,γ) 16O Astrophysical Reaction Rate

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Dokumenter

DOI

  • O. S. Kirsebom
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  • O. Tengblad, CSIC - Instituto de Estructura de la Materia (IEM)
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  • R. Lica, CERN, European Organization for Nuclear Research (CERN), “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • M. Munch
  • K. Riisager
  • H. O.U. Fynbo
  • M. J.G. Borge, CSIC - Instituto de Estructura de la Materia (IEM), CERN, European Organization for Nuclear Research (CERN)
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  • M. Madurga, CERN, European Organization for Nuclear Research (CERN)
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  • I. Marroquin, CSIC - Instituto de Estructura de la Materia (IEM)
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  • A. N. Andreyev, York University, Japan Atomic Energy Agency
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  • T. A. Berry, University of Surrey, UK
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  • E. R. Christensen
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  • P. Díaz Fernández, Chalmers University of Technology
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  • D. T. Doherty, York University
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  • P. Van Duppen, Instituut voor Kern- en Stralingsfysica
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  • L. M. Fraile, Universidad Complutense de Madrid
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  • M. C. Gallardo, Universidad Complutense de Madrid
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  • P. T. Greenlees, University of Jyväskylä, Helsingin yliopisto
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  • L. J. Harkness-Brennan, University of Liverpool
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  • N. Hubbard, York University
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  • M. Huyse, Instituut voor Kern- en Stralingsfysica
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  • J. H. Jensen
  • H. Johansson, Chalmers University of Technology
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  • B. Jonson, Chalmers University of Technology
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  • D. S. Judson, University of Liverpool
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  • J. Konki, CERN, European Organization for Nuclear Research (CERN), University of Jyväskylä, Helsingin yliopisto
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  • I. Lazarus, STFC Daresbury
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  • M. V. Lund
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  • N. Marginean, “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • R. Marginean, “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • A. Perea, CSIC - Instituto de Estructura de la Materia (IEM)
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  • C. Mihai, “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • A. Negret, “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • R. D. Page, University of Liverpool
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  • V. Pucknell, STFC Daresbury
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  • P. Rahkila, University of Jyväskylä, Helsingin yliopisto
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  • O. Sorlin, CERN, European Organization for Nuclear Research (CERN), Institut de Physique Nucléaire de Lyon, CNRS/IN2P3, UMR5822
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  • C. Sotty, “Horia Hulubei” National Institute of Physics and Nuclear Engineering
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  • J. A. Swartz
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  • H. B. Sørensen
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  • H. Törnqvist, Technische Universität Darmstadt, GSI Helmholtzzentrum für Schwerionenforschung
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  • V. Vedia, Universidad Complutense de Madrid
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  • N. Warr, Universitat zu Koln
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  • H. De Witte, Instituut voor Kern- en Stralingsfysica

The C12(α,γ)O16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced α width, γ11, of the bound 1- level in O16 is particularly important to determine the cross section. The magnitude of γ11 is determined via sub-Coulomb α-transfer reactions or the β-delayed α decay of N16, but the latter approach is presently hampered by the lack of sufficiently precise data on the β-decay branching ratios. Here we report improved branching ratios for the bound 1- level [bβ,11=(5.02±0.10)×10-2] and for β-delayed α emission [bβα=(1.59±0.06)×10-5]. Our value for bβα is 33% larger than previously held, leading to a substantial increase in γ11. Our revised value for γ11 is in good agreement with the value obtained in α-transfer studies and the weighted average of the two gives a robust and precise determination of γ11, which provides significantly improved constraints on the C12(α,γ) cross section in the energy range relevant to hydrostatic He burning.

OriginalsprogEngelsk
Artikelnummer142701
TidsskriftPhysical Review Letters
Vol/bind121
Nummer14
ISSN0031-9007
DOI
StatusUdgivet - 3 okt. 2018

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