A precision measurement of the ^3He(α,γ)^7Be astrophysical S-factor

Details A precision measurement of the ^3He(α,γ)^7Be astrophysical S-factor A precision measurement of the ^3He(α,γ)^7Be astrophysical S-factor

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dnp.be006b&link_type=abstract

American Physical Society, 2007 Annual Meeting of the Division of Nuclear Physics, October 10-13,2007, abstract #BE.006

Physics

Nuclear Physics

Scientific paper

The ^3He(α,γ)^7Be reaction is the gateway to the ppII and ppIII branches, providing the principle route to energetic neutrino production in the Sun. The uncertainty on the accepted value of S(0) for this reaction is currently the largest important nuclear physics uncertainty (+/- 10%) in the Solar Model [1]. A more precise value of S34(0) would bring an improvement in solar neutrino flux calculations, and in predictions of ^7Li production in Big-Bang Nucleosynthesis which are currently significantly higher than observed ^7Li abundances [2]. Precision measurements of S34(E) have been made at eight different energies between ECM = 329 and 1235 keV, using the terminal ion source on the Van-de-Graaff accelerator at the University of Washington. The prompt gamma-ray yield and the ^7Be activity have been measured at each energy in the same irradiation, permitting two different methods for determining S34(E). This presentation discusses the experimental details of these measurements, the analysis of the data and our results for S34(0). [1] E. G. Adelberger et al., Rev. Mod. Phys. 70 4 (1998) 1265 [2] P. Bonifacio et al., Astron. Astrophys. 390 (2002) 91

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