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Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO
Journal article   Open access   Peer reviewed

Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO

G. Gallina, Y. Guan, F. Retiere, G. Cao, A. Bolotnikov, I. Kotov, S. Rescia, A. K. Soma, T. Tsang, L. Darroch, …
The European physical journal. C, Particles and fields, v 82(12)
13 Dec 2022
url
https://doi.org/10.1140/epjc/s10052-022-11072-8View
Published, Version of Record (VoR)CC BY V4.0 Open

Abstract

Astronomy Astrophysics and Cosmology Elementary Particles Hadrons Heavy Ions Measurement Science and Instrumentation Nuclear Energy Nuclear Physics Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Regular Article - Experimental Physics String Theory
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0 ν β β ), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for extremely low background operations. The nEXO collaboration has designed a tonne-scale time projection chamber that aims to search for 0 ν β β of 136 Xe with projected half-life sensitivity of 1.35 × 10 28  yr. To reach this sensitivity, the design goal for nEXO is ≤ 1% energy resolution at the decay Q -value ( 2458.07 ± 0.31  keV). Reaching this resolution requires the efficient collection of both the ionization and scintillation produced in the detector. The nEXO design employs Silicon Photo-Multipliers (SiPMs) to detect the vacuum ultra-violet, 175 nm scintillation light of liquid xenon. This paper reports on the characterization of the newest vacuum ultra-violet sensitive Fondazione Bruno Kessler VUVHD3 SiPMs specifically designed for nEXO, as well as new measurements on new test samples of previously characterised Hamamatsu VUV4 Multi Pixel Photon Counters (MPPCs). Various SiPM and MPPC parameters, such as dark noise, gain, direct crosstalk, correlated avalanches and photon detection efficiency were measured as a function of the applied over voltage and wavelength at liquid xenon temperature (163 K). The results from this study are used to provide updated estimates of the achievable energy resolution at the decay Q -value for the nEXO design.

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Physics, Particles & Fields
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