Nucleon capture by 3He and the production of solar hep-neutrinos: Cross-section measurements and shell-model calculations

Details Nucleon capture by 3He and the production of solar hep-neutrinos: Cross-section measurements and shell-model calculations Nucleon capture by 3He and the production of solar hep-neutrinos: Cross-section measurements and shell-model calculations

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nupha.526..265w&link_type=abstract

Nuclear Physics A, Volume 526, Issue 2, p. 265-291.

Physics

Nuclear Physics

24

Nuclear Reactions

Scientific paper

An experimental and theoretical investigation on low-energy nucleon capture by 3He is reported. The extremely small cross section of the 3He(n, γ) reaction has been measured with thermal and with 24.5 keV neutrons, yielding gsnγ(th) = 55 +/- 3 μb and σnγ(24.5 keV) = 9.1 +/- 0.8 μb, respectively. Shell-model calculations that include the contributions of two-body meson-exchange currents are presented for the radiative capture of thermal neutrons by 3He as well as for the weak 3He(p, e+ νe) reaction. With the ratio of the corresponding magnetic dipole and Gamow-Teller matrix elements, and the experimental radiative thermal neutron cross section, a value S = (5.7 +/- 0.8) × 10-19 keV . b is obtained for the astrophysical S- factor of the neutrino-emitting reaction. This indicates that roughly 10% of the measured solar-neutrino flux in the Davis' experiment can be ascribed to the high-energy 3He + p neutrinos.

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