Eos Detector Demonstrates Water-Based Optical Detection Performance for Future Neutrino Experiments
The Eos Collaboration has published the first results from Eos, a four-tonne optical neutrino detector at the University of California, Berkeley, tested using water as an initial target medium. The detector is designed to validate 'hybrid' technology that combines Cherenkov and scintillation light detection, a potential advance for future large-scale neutrino experiments. These early results establish the detector's calibration baseline and reconstruction capabilities before scintillating materials are introduced.
The Eos Collaboration has released its first performance paper describing results from a four-tonne optical detector housed at UC Berkeley. The experiment uses water as an initial fill medium in both its inner target vessel and outer buffer vessel, exploiting water's well-understood property of producing only Cherenkov radiation to calibrate the detector and develop reconstruction algorithms. A suite of optical and radioactive calibration sources were deployed at various positions and orientations to build a detailed detector model. Simulations based on these calibrated models were compared against collected data across multiple source types and configurations, showing good agreement. The primary scientific goal of Eos is to demonstrate the feasibility of hybrid detector technology — which aims to exploit both Cherenkov and scintillation signals simultaneously — for next-generation neutrino detectors. Such hybrid detectors could offer improved particle identification and energy resolution compared to conventional single-channel approaches. The water-phase results represent a foundational commissioning step before the planned deployment of scintillating material.
What's missing
As a preprint, these results have not yet undergone formal peer review.
What different sources said
- arXiv physicsCenter
Performance of the Eos detector with water
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