Speaker
Description
Hybrid neutrino detectors combine Cherenkov and scintillation light to achieve directional sensitivity and high light yield, enhancing particle identification and event reconstruction. Water-based liquid scintillators (WbLS) enable this hybrid approach through tunable mixtures of Cherenkov and scintillation light. A pioneering testbed for WbLS is Eos, a 20-tonne detector located at the University of California, Berkeley, which has been operational since 2023. Eos aims to establish a robust, data-driven optical model across a range of WbLS concentrations. This is essential for accurately simulating detector response and refining reconstruction algorithms.
In this poster, we describe our methodology for measuring the optical properties of a WbLS mixture. Calibration measurements are performed with a variety of optical and radioactive sources, deployed at multiple positions along the vertical axis. Optical calibration data determine the scattering and absorption lengths, while radioactive source data measure the scintillation light yield and characterize the timing of scintillation and re-emission. This work contributes to the foundational understanding of WbLS detector performance and provides essential input for the design and optimization of future kiloton-scale detectors.