National Conference on AI & ML Driven Recent Advances in Condensed Matter and High Energy Physics

Distinguishing Surface from Bulk Events in Point-Contact Germanium Detectors for Neutrino and Dark Matter Detection

Not scheduled

20m

Department of Physics (Ewing Christian College)

Poster High Energy Physics

Speaker

Mr Akash Rajput (Department of Physics, Institute of Applied Sciences and Humanities, GLA University, Mathura)

Description

The TEXONO collaboration conducted neutrino-nucleus scattering studies and light dark
matter investigations using germanium detectors with sub-keV sensitivity. By raising the
detector mass from 500g to 1500g, the TEXONO collaboration has gradually progressed the
usage of PCGe detectors over time, greatly improving sensitivity to low energy events
pertinent to neutrino and dark matter studies. In addition to this scaling in detector mass,

significant efforts have been made to address the ongoing difficulty of differentiating surface-
originated background signals from genuine bulk interactions, especially in the low-energy

area where the rise-time starts to intersect. In order to identify signals at levels equivalent to
electronic noise, subsequent research concentrated on improving energy reconstruction and
noise suppression. The method's resilience is confirmed by actual data from the enhanced
1500g PCGe detector, shows that S/B events can be distinguished up to the electronic noise
edge for sub-keV rare event searches. In this work, timing pulse data from various PCGe
detector masses obtained at the TEXONO reactor experiment will be used to demonstrate
how S/B discriminating techniques are optimized.