1. Exploring charge transport dynamics in a cryogenic P-type germanium detector.
- Author
-
Acharya, P, Fritts, M, Mei, D-M, Wang, G-J, Mahapatra, R, and Platt, M
- Subjects
- *
IMPACT ionization , *ENERGY levels (Quantum mechanics) , *PARTICLE detectors , *BINDING energy , *GERMANIUM detectors , *DARK matter - Abstract
This study explores the dynamics of charge transport within a cryogenic P-type Ge particle detector, fabricated from a crystal cultivated at the University of South Dakota. By subjecting the detector to cryogenic temperatures and an Am-241 source, we observe evolving charge dynamics and the emergence of cluster dipole states, leading to the impact ionization process at 40 mK. Our analysis focuses on crucial parameters: the zero-field cross-section of cluster dipole states and the binding energy of these states. For the Ge detector in our investigation, the zero-field cross-section of cluster dipole states is determined to be 8.45 × 10−11 ± 4.22 × 10−12 cm2. Examination of the binding energy associated with cluster dipole states, formed by charge trapping onto dipole states during the freeze-out process, reveals a value of 0.034 ± 0.0017 meV. These findings shed light on the intricate charge states influenced by the interplay of temperature and electric field, with potential implications for the sensitivity in detecting low-mass dark matter. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF