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Measurement of the branching ratio for β-delayed α decay of 16N

Authors :
J. Refsgaard
O.S. Kirsebom
E.A. Dijck
H.O.U. Fynbo
M.V. Lund
M.N. Portela
R. Raabe
G. Randisi
F. Renzi
S. Sambi
A. Sytema
L. Willmann
H.W. Wilschut
Source :
Physics Letters B, Vol 752, Iss C, Pp 296-301 (2016)
Publication Year :
2016
Publisher :
Elsevier, 2016.

Abstract

While the C12(α,γ)16O reaction plays a central role in nuclear astrophysics, the cross section at energies relevant to hydrostatic helium burning is too small to be directly measured in the laboratory. The β-delayed α spectrum of 16N can be used to constrain the extrapolation of the E1 component of the S-factor; however, with this approach the resulting S-factor becomes strongly correlated with the assumed βα branching ratio. We have remeasured the βα branching ratio by implanting 16N ions in a segmented Si detector and counting the number of βα decays relative to the number of implantations. Our result, 1.49(5)×10−5, represents a 24% increase compared to the accepted value and implies an increase of ≈10% in the extrapolated S-factor.

Details

Language :
English
ISSN :
03702693 and 18732445
Volume :
752
Issue :
C
Database :
Directory of Open Access Journals
Journal :
Physics Letters B
Publication Type :
Academic Journal
Accession number :
edsdoj.008276a1b3a4c9689a528cde9cef549
Document Type :
article
Full Text :
https://doi.org/10.1016/j.physletb.2015.11.047