The SNO+ Experiment

摘要

SNO+ is a large liquid scintillator based experiment located in the SNOLAB underground laboratory in Sudbury, Canada. The SNO+ experiment uses the 12 m diameter acrylic vessel as well as the PMT array of the SNO detector, with several upgrades necessary to fill with liquid scintillator. The main physics goal of SNO+ is the search for the neutrinoless double-beta decay with ~(130)Te. During the initial double-beta phase, the liquid scintillator will be loaded with 0.5% natural tellurium, corresponding to 1330 kg of ~(130)Te for a sensitivity to the effective Majorana neutrino mass in the inverted hierarchy region. Designed as a general purpose neutrino experiment, low background levels and the low thresholds should allow to additionally measure among others the low-energy solar neutrinos, like low energy ~8B, pep and CNO, and reactor anti-neutrinos. Since May 2017 SNO+ is taking data with the detector filled with ultrapure water. The preliminary results of the water phase include the measurement of the ~8B neutrino flux.