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We present a technique for separating nuclear double beta decay($\beta\beta$-decay) events from background neutrino interactions due to$^{8}$B decays in the sun. This background becomes dominant in a kiloton-scaleliquid-scintillator detector deep underground and is usually considered asirreducible due to an overlap in deposited energy with the signal. However,electrons from 0$\nu\beta\beta$-decay often exceed the Cherenkov threshold inliquid scintillator, producing photons that are prompt and correlated indirection with the initial electron direction. The use of large-area fastphotodetectors allows some separation of these prompt photons from delayedisotropic scintillation light and, thus, the possibility of reconstructing theevent topology. Using a simulation of a 6.5~m radius liquid scintillatordetector with 100~ps resolution photodetectors, we show that a sphericalharmonics analysis of early-arrival light can discriminate between0$\nu\beta\beta$-decay signal and $^{8}$B solar neutrino background events on astatistical basis. Good separation will require the development of a slowscintillator with a 5 nsec risetime.

Separating Double-Beta Decay Events from Solar Neutrino Interactions in a Kiloton-Scale Liquid Scintillator Detector By Fast Timing