Speaker
Description
The XENONnT experiment, located at the INFN Laboratori Nazionali del Gran Sasso (LNGS) in Italy, uses a dual-phase xenon time projection chamber with a liquid xenon target of 5.9 tonnes. The electronic recoil (ER) background in the (1, 30) keV region is measured to be (16.1±1.3) events/(tonne×year×keV), five times lower than that in XENON1T and the lowest ever achieved in a dark matter detector. In this presentation, I will report on a blind analysis of low-energy ER data from the first science run of XENONnT, aimed at investigating the excess observed by XENON1T. With an exposure of 1.16 tonne-years, no excess is observed above background and new limits are set on solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter. The XENON1T excess, modeled as a 2.3 keV mono-energetic peak, is excluded with a statistical significance of 4 sigma.
