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

European Organization for Nuclear Research

Horia Hulubei National Institute of Physics and Nuclear Engineering

M. Munch

Aarhus Universitet

K. Riisager

Aarhus Universitet

H. O. U. Fynbo

Aarhus Universitet

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

Japan Atomic Energy Agency

University of York

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

Helsingin Yliopisto

Jyväskylän Yliopisto

L. J. Harkness-Brennan

University of Liverpool

Nicolas Hubbard

Aarhus Universitet

University of York

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

European Organization for Nuclear Research

I. Lazarus

Daresbury Laboratory

M. V. Lund

Aarhus Universitet

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

Helsingin Yliopisto

Jyväskylän Yliopisto

Olivier Sorlin

IN2P3 Institut National de Physique Nucleaire et de Physique des Particules

European Organization for Nuclear Research

C. Sotty

Horia Hulubei National Institute of Physics and Nuclear Engineering

Jacobus A. Swartz

Aarhus Universitet

H. B. Sørensen

Aarhus Universitet

Hans Törnqvist

GSI Helmholtzzentrum für Schwerionenforschung

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 142701

Ämneskategorier

Acceleratorfysik och instrumentering

Subatomär fysik

Atom- och molekylfysik och optik

DOI

10.1103/PhysRevLett.121.142701

PubMed

30339438

Mer information

Senast uppdaterat

2018-10-30