On the Feasibility of Low-Background Ge−NaJ Spectrometer for Neutrino Magnetic Moment Measurement

We analyze the possibility of using a low-background Ge − NaJ spectrometer in a reactor experiment for a search for neutrino magnetic moment down to 3×10−11 of the electron magneton. The properties of the so-far existing Ge low-background spectrometers are discussed and additional sources of background in a reactor experiment at a small depth are estimated. These estimates place specific requirements on the design of the spectrometer. The results of preliminary background measurements at a small depth of 5 m.w.e. with a dedicated spectrometer built in ITEP are reported.