Abstract
AXEL is a high pressure xenon gas TPC with a unique cellular readout structure, ELCC (Electroluminescence Light Collection Cell), for neutrinoless double-beta (0vββ) decay search. We developed two prototype detector and evaluated them. The small size prototype detector (10-L pressure vessel) is constructed first and evaluated its performance to demonstrate the concept of the ELCC. The large size prototype detector (180-L chamber) are being developed to get the know-how for enlargement and for background study. The estimated energy resolutions at the Q-value of 0vββ decay of 136Xe are 0.82~ 1.74% for the former prototype and 0.67% for the latter.
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