Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 17: Neutrino Physics II

T 17.4: Vortrag

Montag, 31. März 2025, 17:30–17:45, VG 3.104

Prospects of Solar Neutrino Detection via Delayed Coincidence Signatures in ¹³⁶Xe Charged Current Interactions with XENONnT — •Henning Schulze Eißing for the XENON collaboration — Institut für Kernphysik, Universität Münster

The XENONnT experiment, located at the INFN Laboratori Nazionali del Gran Sasso, is a dual-phase time projection chamber containing a target mass of 5.9 tonnes of liquid xenon designed for direct dark matter detection. Its unprecedented low background level in the electronic recoil channel enable searches for rare processes beyond its primary science goal.

A search strategy for solar neutrino charged current interactions with ¹³⁶Xe into an excited state of ¹³⁶Cs is being developed, exploiting the unique de-excitation signature of ¹³⁶Cs^* caused by low-lying isomeric states with lifetimes on the order of 100 nanoseconds. This characteristic delayed coincidence signature provides powerful background discrimination in XENONnT’s already low-background environment. The analysis methodology employs two complementary machine learning approaches: a classifier trained to identify the characteristic multi-peak events in the scintillation waveforms, and a reconstruction algorithm capable of resolving individual scintillation signals within merged waveforms. The development of these ML models, their validation, and initial studies of the detection efficiency are presented along with a overview of the search strategy, demonstrating the potential of this approach for solar neutrino measurements with XENONnT.

This work is supported by BMBF ErUM-Pro 05A23PM1.

Keywords: solar neutrinos; xenon detector; machine learning; delayed coincidence; rare event search