ABSTRACT
The cross section and branching ratio for 3He(α,γ) 7Be have been measured from E c.m. = 165 to 1170 keV by counting prompt γ rays from a windowless, recirculating, 3He gas target. Absolute cross sections were also measured at E c.m. = 945 and 1250 keV by measuring the 7Be activity produced in a ‘He gas cell with a Ni entrance foil. The inferred zero-energy intercept is S 34(0) = 0.52 ± 0.03 keV b. The effect of this extrapolated value on the solar-neutrino problem is discussed.
