Results from the Soviet-American gallium experiment

https://doi.org/10.1016/0920-5632(93)90121-LGet rights and content

Abstract

A radiochemical 71Ga-71Ge experiment to determine the primary flux of neutrinos from the Sun began measurements of the solar neutrino flux at the Baksan Neutrino Observatory in 1990. The number of 71Ge atoms extracted from 30 tons of gallium in 1990 and 57 tons in 1991 was measured in twelve runs during the period of January 1990 to December 1991. For the 1990 data, we observed the capture rate to be 20 + 15-20 (stat) ± 32 (syst) SNU, resulting in a limit of less than 79 SNU (90% CL). This is to be compared with 132 SNU predicted by the Standard Solar Model. The 1991 data, taken with 57 tons of gallium, shows a non zero 71Ge signal. A final result from the 1990 and 1991 data is still pending completion of studies of possible systematic effects.

References (10)

  • B.T Cleveland

    Nucl. Instrum. Methods

    (1983)
  • R Davis
  • J.N Bahcall et al.

    Rev. Mod. Phys.

    (1988)
  • S Turck-Chieze et al.

    Ap. J.

    (1988)
  • K.S Hirata

    Phys. Rev. Lett.

    (1990)
There are more references available in the full text version of this article.

Cited by (0)

Present Address: L-421, Lawrence Livermore National Laboratory, Livermore, CA 94550

∗∗

Present address: Dept. of Particle and Nuclear Physics, Oxford University, Keble Road, Oxford, OX1 3RH, England

View full text