CANDLES - Search for neutrino-less double beta decay of 48Ca

CANDLES is the project to search for neutrino-less double beta decay (0 νββ ) of 48 Ca. The observation of 0 νββ will prove existence of a massive Majorana neutrino. For the 0 νββ measurement, we need a low background condition because of a low decay rate of 0 νββ . Now we installed the CANDLES III system at the Kamioka underground laboratory. The CANDLES III system realizes the low background condition by a characteristic structure and data analyses for background rejection. Here we report performances of the CANDLES III system.