Possible Relation of a Null Solar Neutrino Flux to the II Year Solar Cycle

Details Possible Relation of a Null Solar Neutrino Flux to the II Year Solar Cycle Possible Relation of a Null Solar Neutrino Flux to the II Year Solar Cycle

Feb 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.221..650s&link_type=abstract

Nature, Volume 221, Issue 5181, pp. 650-651 (1969).

Physics

23

Scientific paper

AN experimental measurement of the flux of neutrinos from the Sun has recently been reported1. The method uses 3.9×105 l. of C2Cl4 to absorb neutrinos in the 37Cl(ν,e-)37Ar reaction, which has a threshold at 0.81 MeV and is energy-sensitive. Because of the enhanced cross-section for energetic neutrinos, the chief contribution to the counting rate was expected from 8B decay in the solar core2. But the number of neutrinos detected did not exceed the measured background for the instrument, and so served only to provide an upper limit on the flux of energetic solar neutrinos. The authors concluded that less than 9 per cent of the Sun's energy is produced by the carbon-nitrogen cycle.

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