Results on the search of neutrino magnetic moments from the Kuo-Sheng reactor neutrino experiment

Abstract

A laboratory has been set up at the Kuo-Sheng Nuclear Power Station in Taiwan at a distance of 28 m from the 2.9 GW reactor core to study low energy neutrino physics. Data were taken with a high purity germanium detector of mass 1.06 kg and 46 kg of CsI(Tl) crystal scintillator array operating in parallel. A threshold of 5 keV has been achieved for the germanium detector, and the background level is comparable to those of underground Dark Matter experiments. Based on 185/49 days of Reactor ON/OFF data, limits on the neutrino magnetic moment of μ v e < 1.3(1.0) × 10 −10μ B at 90(68)% confidence level were derived. Indirect bounds of the v e radiative lifetime can be inferred.