Regular Article - Experimental Physics
Characterization of water-based liquid scintillator for Cherenkov and scintillation separation
University of California, 94720-7300, Berkeley, CA, USA
2 Lawrence Berkeley National Laboratory, 94720-8153, Berkeley, CA, USA
3 Brookhaven National Laboratory, 11973-500, Upton, NY, USA
Accepted: 29 August 2020
Published online: 20 September 2020
This paper presents measurements of the scintillation light yield and time profile for a number of concentrations of water-based liquid scintillator, formulated from linear alkylbenzene (LAB) and 2,5-diphenyloxazole (PPO). We find that the scintillation light yield is linear with the concentration of liquid scintillator in water between 1 and 10% with a slope of ph/MeV/concentration and an intercept value of ph/MeV, the latter being illustrative of non-linearities with concentration at values less than 1%. This is larger than expected from a simple extrapolation of the pure liquid scintillator light yield. The measured time profiles are consistently faster than that of pure liquid scintillator, with rise times less than 250 ps and prompt decay constants in the range of 2.1–2.85 ns. Additionally, the separation between Cherenkov and scintillation light is quantified using cosmic muons in the CHESS experiment for each formulation, demonstrating an improvement in separation at the centimeter scale. Finally, we briefly discuss the prospects for large-scale detectors.
© The Author(s) 2020
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