Speaker
Description
In this poster we present the first results from Eos, a four-tonne fiducial optical detector located at the University of California, Berkeley. The primary goal of Eos is to demonstrate the performance capabilities of scintillation-based, “hybrid” detector technology for future neutrino detectors, such as Theia. The data presented were collected between July 2024 and May 2025, during which both the inner target vessel and the outer buffer vessel were filled with water. Using deployed optical and radioactive calibration sources, a series of detailed detector calibrations are performed. These enable a suite of tests for the various reconstruction algorithms. Simulations that use calibrated models are compared with the data across a variety of different types of calibration sources and source positions. As of August 2025, Eos has deployed a water-based liquid scintillator into the detector and is continuing to collect data.