Latest progress of PandaX-III neutrinoless double beta decay experiment

Abstract

Neutrinoless double beta decay experiments are one of the most promising approaches to resolving the puzzle of neutrino mass generation. PandaX-III experiment searches the neutrinoless double beta decay of 136Xe with a high-pressure gaseous time projection chamber. A total amount of 140 kg enriched 136Xe under 10 bar will be loaded in the detector. Micromegas is used for charge collection with a high spatial resolution. Benefitting from the long event track in the gaseous detector, identification algorithms can significantly suppress the background rate. In this proceeding, the design and construction of the detector is presented, whose technologies have been successfully demonstrated by a prototype detector. The event classification algorithms were developed, suppressing the background events at a rate of about 300. Based on the result, we expect an exclusion sensitivity of 2.7×1026 yr (90% C.L.) for decay half life after 5 years’ exposure.