Exploring charge transport dynamics in a cryogenic P-type germanium detector

IF 3.4 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2024-07-23 DOI:10.1088/1361-6471/ad60e6

P Acharya, M Fritts, D-M Mei, G-J Wang, R Mahapatra and M Platt

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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.

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探索低温 P 型锗探测器中的电荷传输动力学

这项研究探索了低温 P 型 Ge 粒子探测器内的电荷传输动力学，该探测器是由南达科他大学培育的晶体制成的。通过将探测器置于低温和 Am-241 源下，我们观察到了电荷动态的演变和簇偶极子态的出现，从而导致了 40 mK 时的撞击电离过程。我们的分析侧重于关键参数：簇偶极子态的零场截面和这些态的结合能。对于我们研究中的 Ge 探测器，簇偶极子态的零场截面被确定为 8.45 × 10-11 ± 4.22 × 10-12 cm2。对冻结过程中电荷捕获到偶极子态上而形成的与簇偶极子态相关的结合能的研究显示，其值为 0.034 ± 0.0017 meV。这些发现揭示了受温度和电场相互作用影响的错综复杂的电荷态，对探测低质量暗物质的灵敏度具有潜在影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physics G: Nuclear and Particle Physics 物理-物理：核物理

CiteScore

7.60

自引率

5.70%

发文量

105

审稿时长

1 months

期刊介绍： Journal of Physics G: Nuclear and Particle Physics (JPhysG) publishes articles on theoretical and experimental topics in all areas of nuclear and particle physics, including nuclear and particle astrophysics. The journal welcomes submissions from any interface area between these fields. All aspects of fundamental nuclear physics research, including: nuclear forces and few-body systems; nuclear structure and nuclear reactions; rare decays and fundamental symmetries; hadronic physics, lattice QCD; heavy-ion physics; hot and dense matter, QCD phase diagram. All aspects of elementary particle physics research, including: high-energy particle physics; neutrino physics; phenomenology and theory; beyond standard model physics; electroweak interactions; fundamental symmetries. All aspects of nuclear and particle astrophysics including: nuclear physics of stars and stellar explosions; nucleosynthesis; nuclear equation of state; astrophysical neutrino physics; cosmic rays; dark matter. JPhysG publishes a variety of article types for the community. As well as high-quality research papers, this includes our prestigious topical review series, focus issues, and the rapid publication of letters.