The Kolar Gold Fields neutrino project.

Menon, M.G.K.; Naranan, E.; Narasimham, V.S.; Hinotani, K.; Ito, N.; Miyake, S.; Creed, D.R.; Osborne, J.L.; Wolfendale, A.

Abstract

In the underground laboratory at a depth of 7 600 ft in the Kolar Gold Mines, South India, five telescopes have been in operation for a study of the cosmic radiation which penetrates to such depths. In an exposure of 677 400 m2 sr h (for isotropic radiation) 46 events have been recorded. In seven events the particle trajectory has a projected zenith angle larger than 50°; these are interpreted as due to muons produced by neutrino interactions in the surrounding rock. From this the rate of neutrino-induced events is estimated to be about 3.1 × 10−13/cm2 s sr.The bulk of events with projected zenith angles less than 40° are interpreted as due to atmospheric muons, from considerations of the expected intensity and angular distribution. In between the above-mentioned two groups, there are 10 events in the zenith angle interval 40°–50° compared with an expected number of events of about two. The difference between the observed and expected rates in this angular interval is discussed.Recently, two new solid-iron magnet spectrographs have been installed at the same level, for measuring the momentum and sign of charge of the muons traversing the detector system. Each spectrograph has a maximum detectable momentum of 20 GeV/c and a collecting power of about 35 m2 sr for isotropic radiation.

Citation

Menon, M., Naranan, E., Narasimham, V., Hinotani, K., Ito, N., Miyake, S., …Wolfendale, A. (1968). The Kolar Gold Fields neutrino project. Canadian Journal of Physics, 46(10), S344-S349. https://doi.org/10.1139/p68-243

• Journal Article Type: Article
• Publication Date: 1968-05
• Journal: Canadian Journal of Physics
• Print ISSN: 0008-4204
• Electronic ISSN: 1208-6045
• Publisher: Canadian Science Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 10
• Pages: S344-S349
• DOI: https://doi.org/10.1139/p68-243