Experimental study of upward-going muons in Kamiokande

Details Experimental study of upward-going muons in Kamiokande Experimental study of upward-going muons in Kamiokande

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvd..39.1481o&link_type=abstract

Physical Review D (Particles and Fields), Volume 39, Issue 6, 15 March 1989, pp.1481-1491

Astronomy and Astrophysics

Astronomy

45

Cosmic Rays, Quark And Lepton Masses And Mixing, Cosmic-Ray Interactions, Late Stages Of Stellar Evolution

Scientific paper

Upward-going muons produced in the surrounding rock by high-energy neutrinos from astronomical objects have been searched for using the large underground water Cherenkov detector, Kamiokande. During a total of 1255 days observation, no significant signal was observed from the direction of eight astronomical objects. The 90%-confidence-level (-C.L.) upper limits on upward-going muon fluxes with energy greater than 1.7 GeV are 9.9×10-14 cm-2s-1 for Cygnus X-3 and 2.6×10-14 cm-2s-1 for LMC X-4. Our observed upward-going muon flux is compared with the calculation of the upward-going muon flux produced by the atmospheric neutrinos to examine the neutrino-oscillation hypothesis. The experimental average upward-going muon flux with energy greater than 1.7 GeV, (2.05+/-0.18)×10-13 cm-2s-1sr-1, is consistent with the theoretical expectation. If νμ⇆ντ vacuum oscillations and large mixing angle are assumed, Δm2>~10-2 eV2 is newly rejected. The 90%-C.L. upper limit on the Δm2 for the maximum mixing is found to be Δm2=0.03 eV2 and Δm2=0.0055 eV2, depending on assumptions.

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