Time-Dependent Impact Ionization in a Large-Size Ge Detector Made from a Crystal Grown at USD

ORAL

Abstract

SuperCDMS-style Ge detector made from a crystal grown at USD was operated at the University of Minnesota to observe the time-dependent impact ionization. An Am-241 movable source was used to characterize the energy spectra. The observed time-dependent impact ionization at mK temperature can be explained due to the formation of cluster dipole states. We studied the charge transport properties inside the detector at a cryogenic temperature and attempted to understand the charge collection efficiency using an empirical model. The binding energy of the charged state, A-, was accounted for in the order of < 1meV and impact ionization scattering cross-section in the order of 10-13 cm2.

*This work was supported by NSF OISE-1743790, PHYS1902577, OIA-1738695, DOE FG02-10ER46709, the Office of Research at the University of South Dakota, and a research center supported by the State of South Dakota.

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Presenters

  • PRAMOD ACHARYA

    • University of South Dakota

Authors

  • PRAMOD ACHARYA

    • University of South Dakota

  • Matthew Fritts

    • University of Minnesota

  • D.-M. Mei

    • University of South Dakota

  • Impostor Workshop, University of Minnes

    • University of Minnesota