期刊
JOURNAL OF LOW TEMPERATURE PHYSICS
卷 209, 期 3-4, 页码 263-270出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-022-02826-5
关键词
Quantum efficiency; Infrared laser diodes; Germanium cryogenic detector; Single electron-holes pairs; Neganov-Trofimov-Luke effect; Dark matter
资金
- LabEx Lyon Institute of Origins [ANR-10-LABX-0066]
- EDELWEISS Collaboration
- Ricochet Collaboration
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [ERC-StG-CENNS 803079, 83853]
The aim of the SELENDIS project is to observe single e(-)h(+) pairs in lightweight cryogenic germanium bolometers and characterize the charge creation and collection mechanism. The pairs are produced either by pulsed IR laser or neutron activation of germanium, and low-energy laser pulses are used for sensitivity testing.
The aim of the SELENDIS project within the EDELWEISS collaboration is to observe single e(-)h(+) pairs in lightweight (3.3 g) cryogenic germanium bolometers with charge and phonon readout at biases up to similar to 100 V. These devices are ideal to characterize in detail the mechanism of charge creation and collection in cryogenic germanium detectors. Electron-hole pairs are produced in the bulk of the detector either by the injection of pulsed IR laser or by neutron activation of germanium inducing the K, L and M lines from Ge-71 electron capture decays. Low-energy laser pulses are also used to probe the single e(-)h(+) pair sensitivity of Ge bolometers. Preliminary results are used to compare these two modes of charge creation, an important step toward a detailed characterization of Ge bolometers for their use in subMeV dark matter searches.
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