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This manuscript describes measurements of water-based liquid scintillators(WbLS), demonstrating separation of the Cherenkov and scintillation componentsusing the fast timing response of a Large Area Picosecond Photodector (LAPPD).Additionally, the time profiles of three WbLS mixtures, defined by the relativefractions of scintillating compound, are characterized, with improvedsensitivity to the scintillator rise-time. The measurements were made usingboth an LAPPD and a conventional photomultiplier tube (PMT).  All samples were measured with an effective resolution O(100 ps), whichallows for the separation of Cherenkov and scintillation light (henceforth C/Sseparation) by selecting on the arrival time of the photons alone. TheCherenkov purity of the selected photons is greater than 60% in all cases, withgreater than 80% achieved for a sample containing 1% scintillator. This is thefirst demonstration of the power of synthesizing low light yield scintillators,of which WbLS is the canonical example, with fast photodetectors, of whichLAPPDs are an emerging leader, and has direct implication for future mid- andlarge-scale detectors, such as Theia, ANNIE, and AIT/NEO.

Cherenkov and Scintillation Separation in Water-Based Liquid Scintillator using an LAPPD