Rejection of randomly coinciding 2ν2β events in ZnMoO<sub>4</sub>scintillating bolometers

Chernyak, D.; Danevich, F.A.; Giuliani, A.; Mancuso, M.; Nones, C.; Olivieri, E.; Tenconi, M.; Tretyak, V. I.

doi:10.1051/epjconf/20136504002

Cited by 1 publication

(1 citation statement)

References 19 publications

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“…In dark-matter searches, a high-performance light detector is required to lower the energy threshold [14] and to identify recoils of different-mass nuclei [15]. In double-beta decay searches, high-sensitivity light detectors are needed either to detect the feeble Cherenkov light emitted by poorlyscintillating crystals [16] (this is the case of the promising compound TeO 2 [17,18,19,20,21]), or to help in pile-up rejection (as in 100 Mo-enriched bolometers, [22,23,24]). The pile-up rejection capability is useful also to perform precision calorimetric measurements of rare-β-decay spectral shapes (as those of 113 Cd and 115 In) which can be used to scrutinize the value of the axialvector coupling constant [25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Novati

Bergé

Dumoulin

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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In this work we present how to fabricate large-area (15 cm 2 ), ultra-low threshold germanium bolometric photo-detectors and how to operate them to detect few (optical) photons. These detectors work at temperatures as low as few tens of mK and exploit the Neganov-Trofimov-Luke (NTL) effect. They are operated as charge-to-heat transducers: the heat signal is linearly increased by simply changing a voltage bias applied to special metal electrodes, fabricated onto the germanium absorber, and read by a (NTD-Ge) thermal sensor. We fabricated a batch of five prototypes and ran them in different facilities with dilution refrigerators. We carefully studied how impinging spurious infrared radiation impacts the detector performances, by shining infrared photons via optical-fiber-guided LED signals, in a controlled manner, into the bolometers. We hence demonstrated how the radiation-tightness of the test environment tremendously enhances the detector performances, allowing to set electrode voltage bias up to 90 volts without any leakage current and signal-to-noise gain as large as a factor 12 (for visible photons). As consequence, for the first time we could operate large-area NTD-Ge-sensorequipped NTL bolometric photo-detectors capable to reach sub 10-eV baseline noise (RMS). Such detectors open new frontiers for rare-event search experiments based on low light yield Ge-NTD equipped scintillating bolometers, such the CUPID neutrinoless double-beta decay experiment.1 The enhancement of visible-wavelength photons absorption was initially found to be 35% [45].

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