The cross section and branching ratio for 3 He (a,y) 7 Be have been measured from E c#m# = 165 to 1170 keV by counting prompt y rays from a windowless, recirculating, 3 He gas target. Absolute cross sections were also measured at E CmTr)m = 945 and 1250 keV by measuring the 7 Be activity produced in a 3 He gas cell with a Ni entrance foil. The inferred zero-energy intercept is S M (Q) = 0.52± 0.03 keV b. The effect of this extrapolated value on the solar-neutrino problem is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.