Speaker
Description
EXO-200 is a current generation experiment to search for neutrinoless double beta (0νββ) decay of 136Xe. It was the first of only a few detectors of this scale to run and operated between 2010 and 2018 at the underground Waste Isolation Pilot Plant (WIPP) in southern New Mexico, USA. EXO-200 used 200 kg of 80%-enriched liquid xenon in a single phase, cylindrical time projection chamber (TPC) with scintillator light readout. The experiment set a lower bound on the 0νββ decay of 136Xe of 3.5x10^25 years (90% C.L.), measured the electron spectrum of the 2νββ decay in the same isotope with <3% precision, and searched for the ββ decays of 136Xe to the excited states of 136Ba and of 134Xe. The data collected with EXO-200 have also enabled the search for non-standard physics processes and accurate understanding of the response of large xenon detectors to MeV ionizing radiation. The analysis of EXO-200 data continues past the decommissioning of its hardware. This talk presents an update on searches performed with the so-called Phase-II data set, including a more sensitive search for the 2νββ decay of 136Xe to the first 0+ excited state of 136Ba and the investigation on the existence of exotic dark matter.
