First Accurate Normalization of the β -delayed α Decay of N 16 and Implications for the C 12 (α,γ) O 16 Astrophysical Reaction Rate
Artikel i vetenskaplig tidskrift, 2018
Published by the American Physical Society. 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.
Thermonuclear reactions
Nuclear reactions
Författare
O. S. Kirsebom
Aarhus Universitet
O. Tengblad
CSIC - Instituto de Estructura de la Materia (IEM)
R. Lica
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
CERN
M. Munch
Aarhus Universitet
K. Riisager
Aarhus Universitet
H. O. U. Fynbo
Aarhus Universitet
M. Borge
CSIC - Instituto de Estructura de la Materia (IEM)
CERN
M. Madurga
CERN
I. Marroquin
CSIC - Instituto de Estructura de la Materia (IEM)
A. Andreyev
University of York
Japan Atomic Energy Agency
Tom Berry
University of Surrey
Esben R. Christensen
Aarhus Universitet
Paloma Diaz Fernandez
Chalmers, Fysik, Subatomär fysik och plasmafysik
D. T. Doherty
University of York
P. Van Duppen
KU Leuven
L. M. Fraile
Universidad Complutense de Madrid
Mariano C. Gallardo
Universidad Complutense de Madrid
P. T. Greenlees
Jyväskylän Yliopisto
Helsingin Yliopisto
L. J. Harkness-Brennan
University of Liverpool
Nicolas Hubbard
University of York
Aarhus Universitet
M. Huyse
KU Leuven
J. H. Jensen
Aarhus Universitet
Håkan T Johansson
Chalmers, Fysik, Subatomär fysik och plasmafysik
Björn Jonson
Chalmers, Fysik, Subatomär fysik och plasmafysik
D. S. Judson
University of Liverpool
J. Konki
Jyväskylän Yliopisto
Helsingin Yliopisto
CERN
I. Lazarus
Daresbury Laboratory
M. V. Lund
Aarhus Universitet
N. Marginean
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
R. Marginean
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
A. Perea
CSIC - Instituto de Estructura de la Materia (IEM)
C. Mihai
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
A. Negret
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
R. D. Page
University of Liverpool
V. Pucknell
Daresbury Laboratory
P. Rahkila
Helsingin Yliopisto
Jyväskylän Yliopisto
Olivier Sorlin
CERN
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
C. Sotty
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Jacobus A. Swartz
Aarhus Universitet
H. B. Sørensen
Aarhus Universitet
Hans Törnqvist
Helmholtz
Technische Universität Darmstadt
V. Vedia
Universidad Complutense de Madrid
N. Warr
Universität zu Köln
H. De Witte
KU Leuven
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 121 14 142701Ämneskategorier
Acceleratorfysik och instrumentering
Subatomär fysik
Atom- och molekylfysik och optik
DOI
10.1103/PhysRevLett.121.142701
PubMed
30339438