Limit On the Neutrino Magnetic Moment Using 1496 Days of Super-Kamiokande-i Solar Neutrino Data

摘要

A search for a non-zero neutrino magnetic moment has been conducted using1496 live days of solar neutrino data from {\SK}. Specifically, we searched fordistortions to the energy spectrum of recoil electrons arising from magneticscattering due to a non-zero neutrino magnetic moment. In the absence of clearsignal, we found $\mu_{\nu} \leq 3.6 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. byfitting to the Super-Kamiokande day/night spectra. The fitting took intoaccount the effect of neutrino oscillation on the shapes of energy spectra.With additional information from other solar neutrino and KamLAND experimentsconstraining the oscillation region, a limit of $\mu_{\nu} \leq 1.1 \times10^{-10}$ $\mu_{B}$ at 90% C.L. was obtained.