The rate of the He-3(p,e+ nu) - He-4 reaction

Details The rate of the He-3(p,e+ nu) - He-4 reaction The rate of the He-3(p,e+ nu) - He-4 reaction

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..311t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 311-316. Research supported by the Naturvetenskaplig

Physics

24

Capture Effect, Helium Isotopes, Nuclear Reactions, Protons, Solar Neutrinos, Reaction Kinetics, Solar Physics, Thermal Neutrons

Scientific paper

The reaction rate of He-3 with a proton to produce He-4 + e(+) nu is estimated. The matrix elements of the He-3 + p reaction and of thermal neutron capture are calculated rigorously, and the assumptions used by Werntz and Brennan (1967) in their calculation are shown to be incorrect. Meson exchange contributions are estimated at 20 percent, and the reaction rate at solar temperatures is calculated using experimental cross sections of the (n, gamma) reaction: the cross section factor S(Ep = 0) is between 4 and 25 x 10 to the -20th keV barns, or about 6 times larger than predicted by Werntz and Brennan. However, the neutrinos from the reaction are found to contribute less than 3 percent to the predicted Cl-37 capture rate and 0.03 percent to the Ga-71 capture rate.

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