PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Dark Matter and its Detection
Investigating Compton steps in SuperCDMS Si HVeV detectors
S. Das*  on behalf of the SuperCDMS Collaboration
Full text: pdf
Pre-published on: February 27, 2024
Published on: March 22, 2024
SuperCDMS is constructing its next generation experiment at SNOLAB to detect dark matter candidates with masses $\leq$ 10 GeV/$c^2$ using pure Ge and Si detectors operated at cryogenic temperature. These detectors are of two types. The interleaved Z-sensitive Ionization and Phonon (iZIP) detectors can differentiate between nuclear and electron recoils, providing effective background rejection, while the High Voltage (HV) detectors use high voltage bias to attain excellent energy resolution and low energy threshold. To analyze dark matter search data, an accurate energy calibration of these detectors is necessary. Unlike in Ge detectors, there are no activation lines in Si that can be used for low energy calibration ($\leq$ $\mathcal O$(keV)). However, Si Compton steps can serve as an alternative for energy calibration in this region. The SuperCDMS Si HVeV detectors, with their energy resolution of $\mathcal O$(eV) and energy thresholds of $\mathcal O$(10 eV), are the perfect instruments to study the Compton steps. This work aims to investigate the K shell Compton steps at 1.8 keV for Si HVeV detectors and compare them with a calibration derived from optical photons. The understanding of Compton steps for these detectors will aid in calibrating the larger SuperCDMS SNOLAB Si HV detectors.
DOI: https://doi.org/10.22323/1.441.0077
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