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T: Fachverband Teilchenphysik
T 41: Search for Dark Matter II
T 41.3: Talk
Tuesday, April 1, 2025, 16:45–17:00, VG 4.102
The first measurement of coherent elastic nucleus scattering of solar 8B neutrinos in the XENONnT experiment. — •Daniel Wenz for the XENON collaboration — University of Muenster
Liquid xenon (LXe) dual-phase time projection chambers (TPC) are thanks to their low energy threshold of sub-keV level and excellent background discrimination, the leading technology in the search for WIMP dark matter. They are also well suited to study other rare and faint phenomena like the coherent elastic neutrino-nucleus scattering (CEvNS) of solar neutrinos, opening a window towards solar and neutrino physics at lowest energies.
On of the leading experiment in this field is the XENONnT experiment, a highly sensitive, low background, dual-phase TPC with a LXe target volume of 5.9 t located at the Laboratori Nazionali del Gran Sasso (LNGS). In this talk the first measurement of solar 8B neutrinos through CEvNS are presented by performing a dedicated low energy blind analysis, using an exposure of 3.51 t·yr. The background only hypothesis was rejected with 2.73 sigma, resulting in a measured 8B flux of (4.7−2.3+3.6)·10−6cm−2s−1. This result not only represents the very first measurement of CEvNS in LXe, but also CEvNS from solar neutrinos in general. It is therefore an important milestone towards a future liquid xenon observatory, not only for dark matter, but also for neutrino and solar physics.
This work is supported by BMBF ErUM-Pro 05A23PM1.
Keywords: Coherent elastic neutrino nucleus scattering; Liquid Xenon; Dark Matter; Dual-phase time projection chamber