The flux of upward through-going muons of minimum (mean) threshold energy >1.6 (3.0) GeV is measured, based on a total of 372 events observed by the Kamiokande II+III detector during 2456 detector live days. The observed muon flux was Φobs = [1.94 + ± 0.01(stat.)+0.070.06sys.]×10−13cm−2s−1sr−1, which is compared to an expected value of Φtheo = [2.46 + ± 0.54(theo.)]×10−13cm−2s−1sr−1. The observation is in agreement with the prediction within the errors. The zenith-angle dependence of the observed upward through-going muons supports the previous indication of neutrino oscillations made by Kamiokande using sub- and multi-GeV atmospheric neutrino events.
ASJC Scopus subject areas
- Physics and Astronomy(all)