Search for Neutrinos from the Sun*

A search was made for solar neutrinos with a detector based upon the reaction Cl³⁷, (υ,e^–)Ar³⁷ . The upper limit of the product of the neutrino flux and the cross sections for all sources of neutrinos was 3 × 10⁻³⁶ sec⁻¹ per C1³⁷ atom. It was concluded specifically that the flux of neutrinos from B⁸ decay in the sun was equal to or less than 2 × 10⁸ cm⁻² sec⁻¹ at the earth, and that less than 9% of the sun’s energy is produced by the carbon-nitrogen cycle.