Upper limit on the neutrino magnetic moment from three years of data from the GEMMA spectrometer

摘要: The result of the 3-year neutrino magnetic moment measurement at Kalinin Nuclear Power Plant (KNPP) with GEMMA spectrometer is presented. Antineutrino-electron scattering investigated. A high-purity germanium detector 1.5 kg placed a distance 13.9 m from centre 3 GWth reactor core used in spectrometer. antineutrino flux 2.7� 10 13 ¯ �e/cm 2 /s. differential method to extract �-e electromagnetic events. scattered electron spectra taken 5184+6798 and 1853+1021 hours during ON OFF periods respectively are compared. upper limits for µ� without atomic ionization mechanism were found be 5.0� −12 µB 3.2� −11 90% CL, respectively.