Study of Double Beta Decay of 150Nd with KamLAND Detector

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The development of the Neodymium loaded liquid scintillator (LS) and Xenon dissolved LS was performed from the view point of neutrino-less double beta decay (0νββ) measurement. The properties such as maximum dissolved amount, scintillation light yield and optical transparency, were measured. As a consequence, it was found that ^<136>Xe was a promising 0νββ nucleus. The installation method of Xe dissolved LS into the KamLAND detector was established by the preliminary experiments. The sensitivity of the 0νββ decay in the KamLAND was estimated to be ~50 meV for the effective Majorana neutrino mass by using 400 kg of ^<136>Xe for 2 years measurement.