Combined scintillation and track technique to search for ββ-decay

A variant of the scintillation spectrometer with wire chambers for ββ-decay search is considered. The time-of-flight technique for background suppression is suggested. The (-3 m2) source placed in the centre of the facility comprises three planes. Four wire chambers measure particle tracks in the centre of the source. The whole volume is filled with helium. Scintillation counters are produced of long plates. Four plates form a counter with two fast photomultipliers on both edges. Electron time-of-flight between the scintillators makes up 2-5 ns. If the mass of the (150Nd) source is equal to 75 g, then the half-decay period may be measured T1/2=1022 years