First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate

Show full item record



Permalink

http://hdl.handle.net/10138/253857

Citation

Kirsebom , O S , Tengblad , O , Lica , R , Munch , M , Riisager , K , Fynbo , H O U , Borge , M J G , Madurga , M , Marroquin , I , Andreyev , A N , Berry , T A , Christensen , E R , Fernandez , P D , Doherty , D T , Van Duppen , P , Fraile , L M , Gallardo , M C , Greenlees , P T , Harkness-Brennan , L J , Hubbard , N , Huyse , M , Jensen , J H , Johansson , H , Jonson , B , Judson , D S , Konki , J , Lazarus , I , Lund , M V , Marginean , N , Marginean , R , Perea , A , Mihai , C , Negret , A , Page , R D , Pucknell , V , Rahkila , P , Sorlin , O , Sotty , C , Swartz , J A , Sorensen , H B , Toernqvist , H , Vedia , V , Warr , N & De Witte , H 2018 , ' First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate ' , Physical Review Letters , vol. 121 , no. 14 , 142701 . https://doi.org/10.1103/PhysRevLett.121.142701

Title: First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate
Author: Kirsebom, O. S.; Tengblad, O.; Lica, R.; Munch, M.; Riisager, K.; Fynbo, H. O. U.; Borge, M. J. G.; Madurga, M.; Marroquin, I.; Andreyev, A. N.; Berry, T. A.; Christensen, E. R.; Fernandez, P. Diaz; Doherty, D. T.; Van Duppen, P.; Fraile, L. M.; Gallardo, M. C.; Greenlees, P. T.; Harkness-Brennan, L. J.; Hubbard, N.; Huyse, M.; Jensen, J. H.; Johansson, H.; Jonson, B.; Judson, D. S.; Konki, J.; Lazarus, I.; Lund, M. V.; Marginean, N.; Marginean, R.; Perea, A.; Mihai, C.; Negret, A.; Page, R. D.; Pucknell, V.; Rahkila, P.; Sorlin, O.; Sotty, C.; Swartz, J. A.; Sorensen, H. B.; Toernqvist, H.; Vedia, V.; Warr, N.; De Witte, H.
Contributor organization: Helsinki Institute of Physics
Date: 2018-10-03
Language: eng
Number of pages: 6
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.121.142701
URI: http://hdl.handle.net/10138/253857
Abstract: The C-12(alpha,gamma)O-16 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 a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.
Subject: BRANCHING RATIO
CROSS-SECTION
ENERGY-LEVELS
LIGHT-NUCLEI
O-16
MATRIX
LEVEL
STATE
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
PhysRevLett.121.142701.pdf 326.3Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record