Speaker
Description
XENONnT is a liquid-xenon time projection chamber operated at the Gran Sasso underground laboratory in Italy, 5.9 tonne active xenon target of ultra-pure xenon to search for rare signals induced by dark matter and neutrinos. In this talk, I will present recent XENONnT results on solar $^8$B neutrinos and light dark matter.
A key experimental ingredient is the low-energy nuclear-recoil calibration with a $^{88}$YBe photoneutron source, which enabled XENONnT to measure the liquid-xenon response close to threshold, with the light yield extracted down to 0.3 keV$_\mathrm{NR}$. Using a 6.77 tonne-year exposure, XENONnT reported a 3.3$\sigma$ measurement of coherent elastic neutrino-nucleus scattering from solar $^8$B neutrinos, inferred a solar $^8$B neutrino flux consistent with previous measurements, and explored the emerging neutrino-fog regime for light dark matter searches. The same dataset shows no evidence for light dark matter in the low-energy nuclear-recoil region, illustrating how solar neutrinos become both a new signal channel and an irreducible background for future searches.
