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EXO-200 releases public dataset for AI/ML applications

Mon, 28 Sep 2026 00:00:00 +0000

The EXO-200 collaboration has publicly released a subset of its calibration data, described in a new paper, .

The dataset contains approximately one million events recorded during ²²⁸Th calibration campaigns near the end of EXO-200 Phase-II operations in early 2018. For every event it provides the raw waveforms from the U-wire, V-wire, and avalanche photodiode readout channels, together with reconstructed quantities such as charge energy, light energy, and charge-cluster information.

The data are distributed in HDF5 format and are intended to support data preservation, teaching, and the development of modern machine-learning techniques for rare-event physics.

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Two new DarkSide-20k instrumentation papers

Fri, 03 Apr 2026 00:00:00 +0000

The DarkSide-20k collaboration has released two papers documenting major pieces of the detector’s instrumentation. Both have since been published.

The data acquisition system. (JINST 21, P09017) presents the DAQ that will read out the experiment’s 2720 SiPM-based channels. The system digitizes waveforms continuously, without a hardware trigger, and processes them online to reduce the data volume for long-term storage. A full “Quadrant” — one quarter of the final system — has been assembled and validated at TRIUMF.

The veto photosensors. (Eur. Phys. J. C 86, 1089) describes the completed production and testing of the “vTiles”, arrays of 24 SiPMs that instrument the Inner Veto. Each tile was tested at room and cryogenic temperature; the final production yield exceeded 87%, above the 80% requirement, providing the 1920 tiles needed for 120 veto photodetector units plus spares.

New results on low-mass dark matter and double beta decay of ¹³⁴Xe

Mon, 17 Nov 2025 00:00:00 +0000

Two new results were released on the same day, one from each side of our research program. Both have since been published.

Low-mass dark matter in liquid argon. (Phys. Rev. D 113, 123045) combines new measurements from the ReD setup with calibration data from DarkSide-50 and results from the ARIS and SCENE experiments to better constrain how liquid argon responds to nuclear recoils at keV energies. Applying the updated model to DarkSide-50 data yields stronger exclusion limits on low-mass WIMP interactions, and the paper recasts the sensitivity projections for DarkSide-20k.

Double beta decay of ¹³⁴Xe. (Phys. Rev. Lett. 136, 232502) reports no significant signal and sets a world-leading lower limit of 8.7 × 10²³ years (90% C.L.) on the half-life of the neutrinoless mode, along with a threefold improvement over the EXO-200 Phase I constraint on the two-neutrino mode.

DarkSide-20k SiPM tile production paper released

Wed, 09 Jul 2025 00:00:00 +0000

A new DarkSide-20k paper, , describes how the photosensors for the experiment’s 21 m² SiPM array are built and tested.

The SiPMs are arranged into modular photosensors called Tiles, each integrating 24 SiPMs on a printed circuit board that provides signal amplification and power distribution; 16 Tiles form a Photo-Detector Unit. Production and quality control take place at Nuova Officina Assergi (NOA), an ISO-6 clean room at LNGS, and include wafer-level cryogenic characterization, die attaching, wire bonding, and electrical and optical validation of every Tile. The overall production yield exceeds 83.5%, meeting the requirements of the DarkSide-20k production plan.

The paper was published in Eur. Phys. J. C 85, 1334 (2025). Read more about and our .