Cryogenic phonon detectors are adopted in experiments searching for dark matter interactions or coherent elastic neutrino-nucleus scattering, thanks to the low energy threshold they can achieve. The phonon-mediated sensing of particle interactions in passive silicon absorbers has been demonstrated with Kinetic Inductance Detectors (KIDs). Targets with neutron number larger than silicon, however, feature higher cross section to neutrinos while multi-target absorbers in dark matter experiments would provide a stronger evidence of a possible signal. In this work we present the design, fabrication and operation of KIDs coupled to a germanium absorber, achieving phonon-sensing performance comparable to silicon absorbers. The device introduced in this work is a proof of concept for a scalable neutrino detector and for a multi-target dark matter experiment.
@article{arxiv.2412.07379,
title = {Germanium target sensed by phonon-mediated kinetic inductance detectors},
author = {D. Delicato and D. Angelone and L. Bandiera and M. Calvo and M. Cappelli and U. Chowdhury and G. Del Castello and M. Folcarelli and M. del Gallo Roccagiovine and V. Guidi and G. L. Pesce and M. Romagnoni and A. Cruciani and A. Mazzolari and A. Monfardini and M. Vignati},
journal= {arXiv preprint arXiv:2412.07379},
year = {2025}
}