Abstract
For detecting the nuclear double beta decay of136Xe, a liquid-xenon positive-ion collector and a time-of-flight mass spectrometer are under development for detecting the decay product136Ba. Two sets of lasers are used with the mass spectrometer. An Nd-YAG laser is used for sampling136Ba from the surface of the positive-ion collector electrode, and a dye laser pumped by an Nd-YAG laser is used for the selective ionization of136Ba. The principle of measurements as well as the experimental apparatus and procedures are described in detail, together with our future plans.
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