A xenon time projection chamber has been constructed to study double beta decay in136Xe. The excellent track reconstruction capability of the TPC provides a powerful means of background identification. We have demonstrated the novel technique of measuring the directionality of low energy (MeV range) electrons by the difference of dE dx between their beginnings and ends. Rejection efficiencies are 100% for alpha particles, cosmic muons and multiple Compton scattering, and more than 98% for single electrons, while the identification efficiencies for events due to neutrinoless double beta decay are 76% and 65% for the mass mechanism and right-handed currents modes, respectively. Very sensitive limit has been achieved for the half-life of the 0νββ channel. The tracking performance of the TPC as well as the event analysis and background rejection procedures of the experiment are discussed. © 1993.
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