The3He( α, γ)7Be reaction and the solar neutrino problem

Details The3He( α, γ)7Be reaction and the solar neutrino problem The3He( α, γ)7Be reaction and the solar neutrino problem

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982zphya.304..307k&link_type=abstract

Zeitschrift für Physik A Atoms and Nuclei, Volume 304, Issue 4, pp.307-332

Astronomy and Astrophysics

Astrophysics

60

Scientific paper

The capture reaction3He(α, γ)7Be has been investigated in the energy range of E c.m. =107 to 1,266 keV. The4He or3He beams of up to 300 μA particle current were incident on3He or4He gas targets, respectively. The gas target systems were all of the windowless and recirculating type. Excitation functions have been obtained with the use of an extended-static gas target, while the measurements of γ-ray angular distributions involved a quasi-point supersonic jet system. The determination of absolute cross sections has been carried out with both types of gas target systems. The γ-ray yields in the3He( α, γ)7Be reaction were detected using 80 cm3 Ge(Li) detectors. The data lead to a zero-energy intercept of the astrophysical S( E) factor of S(0)=0.30±0.03 keV-b. This result reduces the calculated solar neutrino rate by a factor of 1.76.

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