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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.18388 |
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| _version_ | 1866910347278942208 |
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| author | Acharya, P. Fritts, M. Mei, D. -M. Wang, G. -J. Mahapatra, R. Platt, M. |
| author_facet | Acharya, P. Fritts, M. Mei, D. -M. Wang, G. -J. Mahapatra, R. Platt, M. |
| contents | 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 (USD). 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 $8.45 \times 10^{-11}\pm 4.22\times 10^{-12}~cm^2$. 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 $0.034 \pm 0.0017$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_18388 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring Charge Transport Dynamics in a Cryogenic P-Type Germanium Detector Acharya, P. Fritts, M. Mei, D. -M. Wang, G. -J. Mahapatra, R. Platt, M. Instrumentation and Detectors High Energy Physics - Experiment 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 (USD). 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 $8.45 \times 10^{-11}\pm 4.22\times 10^{-12}~cm^2$. 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 $0.034 \pm 0.0017$ 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. |
| title | Exploring Charge Transport Dynamics in a Cryogenic P-Type Germanium Detector |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2402.18388 |