Abstract
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 \(\sim 100\) 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 \(^{71}\)Ge 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 sub-MeV dark matter searches.
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Notes
\(\eta = 1\) is assumed for 1550 nm photons
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Acknowledgements
We acknowledge the support from the EDELWEISS Collaboration, the Ricochet Collaboration, LabEx Lyon Institute of Origins (ANR-10-LABX-0066), the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under Grant Agreement ERC-StG-CENNS 803079 and Marie Skłodowska-Curie Grant Agreement No. 83853.
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Lattaud, H., Arnaud, Q., Billard, J. et al. Phonon and Charge Signals from IR and X Excitation in the SELENDIS Ge Cryogenic Detector. J Low Temp Phys 209, 263–270 (2022). https://doi.org/10.1007/s10909-022-02826-5
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DOI: https://doi.org/10.1007/s10909-022-02826-5