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
Journal article, 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

Author

O. S. Kirsebom

Aarhus University

O. Tengblad

CSIC - Instituto de Estructura de la Materia (IEM)

R. Lica

Horia Hulubei National Institute of Physics and Nuclear Engineering

European Organization for Nuclear Research

M. Munch

Aarhus University

K. Riisager

Aarhus University

H. O. U. Fynbo

Aarhus University

M. Borge

European Organization for Nuclear Research

CSIC - Instituto de Estructura de la Materia (IEM)

M. Madurga

European Organization for Nuclear Research

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 University

Paloma Diaz Fernandez

Chalmers, Physics, Subatomic and Plasma Physics

D. T. Doherty

University of York

P. Van Duppen

KU Leuven

L. M. Fraile

Complutense University

Mariano C. Gallardo

Complutense University

P. T. Greenlees

University of Helsinki

University of Jyväskylä

L. J. Harkness-Brennan

University of Liverpool

Nicolas Hubbard

University of York

Aarhus University

M. Huyse

KU Leuven

J. H. Jensen

Aarhus University

Håkan T Johansson

Chalmers, Physics, Subatomic and Plasma Physics

Björn Jonson

Chalmers, Physics, Subatomic and Plasma Physics

D. S. Judson

University of Liverpool

J. Konki

University of Jyväskylä

European Organization for Nuclear Research

University of Helsinki

I. Lazarus

Daresbury Laboratory

M. V. Lund

Aarhus University

N. Marginean

Horia Hulubei National Institute of Physics and Nuclear Engineering

R. Marginean

Horia Hulubei National Institute of Physics and Nuclear Engineering

A. Perea

CSIC - Instituto de Estructura de la Materia (IEM)

C. Mihai

Horia Hulubei National Institute of Physics and Nuclear Engineering

A. Negret

Horia Hulubei National Institute of Physics and Nuclear Engineering

R. D. Page

University of Liverpool

V. Pucknell

Daresbury Laboratory

P. Rahkila

University of Helsinki

University of Jyväskylä

Olivier Sorlin

European Organization for Nuclear Research

IN2P3 Institut National de Physique Nucleaire et de Physique des Particules

C. Sotty

Horia Hulubei National Institute of Physics and Nuclear Engineering

Jacobus A. Swartz

Aarhus University

H. B. Sørensen

Aarhus University

Hans Törnqvist

GSI Helmholtz Centre for Heavy Ion Research

Technische Universität Darmstadt

V. Vedia

Complutense University

N. Warr

University of Cologne

H. De Witte

KU Leuven

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 121 14 142701

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Atom and Molecular Physics and Optics

DOI

10.1103/PhysRevLett.121.142701

PubMed

30339438

More information

Latest update

12/10/2018