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The ^2H(d,γ) ^4He reaction at low energy and the D-state admixture in ^4He

Barnes, C. A. and Chang, K. H. and Donoghue, T. R. and Rolfs, C. and Kammeraad, J. (1987) The ^2H(d,γ) ^4He reaction at low energy and the D-state admixture in ^4He. Physics Letters B, 197 (3). pp. 315-319. ISSN 0370-2693. https://resolver.caltech.edu/CaltechAUTHORS:20150911-122141338

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Abstract

The cross section and angular distribution of the ^2H(d,γ) ^4He reaction have been measured from E^(CM) = 50 to 500 keV. For E⩽200 keV, the observed near-constant cross-section S-factor and isotropy show that the dominant radiative capture amplitude is ^5S_2→^5D_0, instead of the ^1D_2→^1S_0 amplitude that dominates at higher energies. Thus the ^4He D-state admixture can be determined from the low-energy cross section alone. Values obtained from different models range up to 14%. As the new astrophysical S-factor is 32 times larger than previously estimated, it will likely affect inhomogeneous big-bang nucleosynthesis models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.oi.org/10.1016/0370-2693(87)90391-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0370269387903911PublisherArticle
Additional Information:© 1987 Elsevier. Received 24 June 1987. Two of us (TRD and CR) wish to acknowledge the hospitality of the W.K. Kellogg Radiation Laboratory. Fruitful discussions with W.A. Fowler, R.W. Kavanagh, T.A. Tombrello, and R.V. Wagoner are acknowledged. We thank U. Schroder for the DC calculations, A. Rice for assistance, and H.J. Assenbaum, K. Langanke, J. Piekarewicz, and S.E. Koonin for communication of their analyses prior to publication. This work was performed in part under the Department of Energy contract W-7405-Eng-48 with the Lawrence Livermore National Laboratory, and was also supported in part by the National Science Foundation, Grants PHY85-05682 at Caltech and PHY85-04733 at Ohio State University.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)W-7405-ENG-48
Lawrence Livermore National LaboratoryUNSPECIFIED
NSFPHY85-05682
NSFPHY85-04733
Issue or Number:3
Record Number:CaltechAUTHORS:20150911-122141338
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150911-122141338
Official Citation:C.A. Barnes, K.H. Chang, T.R. Donoghue, C. Rolfs, J. Kammeraad, The 2H(d,γ) 4He reaction at low energy and the D-state admixture in 4He, Physics Letters B, Volume 197, Issue 3, 29 October 1987, Pages 315-319, ISSN 0370-2693, http://dx.doi.org/10.1016/0370-2693(87)90391-1. (http://www.sciencedirect.com/science/article/pii/0370269387903911)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60189
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Sep 2015 23:08
Last Modified:03 Oct 2019 08:54

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