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arXiv · 2112.11759

Phonon and charge signals from IR and X excitation in the SELENDIS Ge cryogenic detector

H. Lattaud·Q. Arnaud·J. Billard·J. Colas·L. Dumoulin·M. De Jésus·A. Juillard·J. Gascon·S. Marnieros·C. Oriol
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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 (DM) searches.

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H. Lattaud, Q. Arnaud, J. Billard, J. Colas, L. Dumoulin, M. De Jésus, A. Juillard, J. Gascon, S. Marnieros, C. Oriol. 2021-12-22. Phonon and charge signals from IR and X excitation in the SELENDIS Ge cryogenic detector. https://doi.org/10.1007/s10909-022-02826-5

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