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Abstract:
Solar neutrinos interacting with nuclei in dark matter detectors through coherent elastic neutrino-nucleus scattering (CEvNS), often referred to as the 'neutrino fog,' presents a significant challenge to direct DM detection efforts. The XENONnT detector, known for its large exposure and low background, offers an exceptional opportunity to investigate this interaction. Utilizing data from XENONnT's first and second science runs, we searched for CEvNS signals of solar B-8 neutrinos, resulting in 37 observed events above 0.5 keV, with the 26.4 background events expected, led to the rejection of the background-only hypothesis with a statistical significance of 2.73-sigma. This marks the first direct detection of nuclear recoils from solar neutrinos using a dark matter detector. In this seminar, I will present a detailed view of the search for solar B-8 CEvNS and a first search for light dark matter signals in neutrino fog.
Biography:
Prof. Fei Gao received his PhD at Shanghai Jiao Tong University in 2016. He then moved to Columbia for postdoctoral research in Prof. Elena Aprile's group to work on the first tonne-scale dark matter search experiment XENON1T. He became an assistant professor at the Department of Physics, Tsinghua University in 2020 and was promoted to associate professor in 2022.
Prof. Gao specialized in dark matter and neutrino experiments. He is a member of the XENON experiment and serves as an analysis coordinator (until 2021) and a member of the Science Strategy Team. He founded the RELICS reactor neutrino experiment in 2021 and was supported by a grant from the National Key R&D Project for young scientists. He is also a member of the CDEX Collaboration and the XLZD Collaboration. He is an editor for the Journal of Instrumentation.
Host: Prof. Jianglai Liu
Alternative online link: https://meeting.tencent.com/dm/WP6bQOQ5IJa9 (id: 854915097 passcode: 123456）