First demonstration of a TES based cryogenic Li2MoO4 detector for neutrinoless double beta decay search
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10052_2025_Article_13844.pdf
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Author(s)
Bratrud, G.
Chang, C. L.
Chen, R.
Cudmore, E.
Figueroa-Feliciano, E.
Hong, Z.
Kennard, K. T.
Lewis, S.
Lisovenko, M.
Mateo, L. O.
Date Issued
January 31, 2025
Journal
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
Bratrud, G., Chang, C.L., Chen, R. et al. First demonstration of a TES based cryogenic Li2MoO4 detector
for neutrinoless double beta decay search. Eur. Phys. J. C 85, 118 (2025).
Version
Final published version
Abstract
Cryogenic calorimetric experiments to search for neutrinoless double-beta decay ( 0 ν β β ) are highly competitive, scalable and versatile in isotope. The largest planned detector array, CUPID, is comprised of about 1500 individual Li 2 100 MoO 4 detector modules with a further scale up envisioned for a follow up experiment (CUPID-1T). In this article, we present a novel detector concept targeting this second stage with a low impedance TES based readout for the Li 2 MoO 4 absorber that is easily mass-produced and lends itself to a multiplexed readout. We present the detector design and results from a first prototype detector operated at the NEXUS shallow underground facility at Fermilab. The detector is a 2-cm-side cube with 21 g mass that is strongly thermally coupled to its readout chip to allow rise-times of ∼ 0.5 ms. This design is more than one order of magnitude faster than present NTD based detectors and is hence expected to effectively mitigate backgrounds generated through the pile-up of two independent two neutrino decay events coinciding close in time. Together with a baseline resolution of 1.95 keV (FWHM) these performance parameters extrapolate to a background index from pile-up as low as 5 · 10 - 6 counts/keV/kg/yr in CUPID size crystals. The detector was calibrated up to the MeV region showing sufficient dynamic range for 0 ν β β searches. In combination with a SuperCDMS HVeV detector this setup also allowed us to perform a precision measurement of the scintillation time constants of Li 2 MoO 4 , which showed a primary component with a fast O(20 μ s) time scale.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-025-13844-4
