Speaker
Mr
Koh Ueno
(Institute for Cosmic Ray Research, University of Tokyo)
Description
GUT monopoles captured by the Sun's gravitation are expected to catalyze proton decays via the Callan-Rubakov process. In this scenario, protons, which initially decay into pions, will ultimately produce nu_e, nu_mu and nu_mu_bar. After going through neutrino oscillation, all neutrino species appear when they arrive at the Earth, and can be detected by a 50000 ton water Cherenkov detector, Super-Kamiokande. A search for low energy neutrinos from the Sun (in the visible energy range from 18 to 55 MeV) has been carried out with Super-Kamiokande and is expected to give the cross section and velocity dependent limit on the monopole flux, F < 7 x 10-24 cm-2 s-1 sr-1 for beta=10-3 and sigma=1mb at 90%C.L. This is a much more stringent limit than the current best cosmic-ray supermassive monopole flux limit: F < 1 x 10-15 cm-2 s-1 sr-1 for 1.1 x 10-4 < beta < 0.1.
Primary author
Mr
Koh Ueno
(Institute for Cosmic Ray Research, University of Tokyo)
