Abstract
The water-based liquid scintillator (WbLS) is a new material currently under development. It is based on the idea of dissolving the organic scintillator in water using special surfactants. This material strives to achieve the novel detection techniques by combining the Cerenkov rings and scintillation light, as well as the total cost reduction compared to pure liquid scintillator (LS). The independent light yield measurement analysis for the light yield measurements using three different proton beam energies (210 MeV, 475 MeV, and 2000 MeV) for water, two different WbLS formulations (0.4% and 0.99%), and pure LS conducted at Brookhaven National Laboratory, USA, is presented. The results show that a goal of ~100 optical photons/MeV, indicated by the simulation to be an optimal light yield for observing both the Cerenkov ring and the scintillation light from the proton decay in a large water detector, has been achieved.
Highlights
In either liquid scintillator (LS) or water-based liquid scintillator (WbLS), the isotropic scintillation light is produced by the charged particle energy deposition via ionization, but the scintillator components may interfere with the Cerenkov ring detection
As it can be seen from these figures, the estimate shows that the goal of about 100 photons/MeV has been reached using the WbLS2 sample, and different light yield (LY) are possible by adjusting the concentrations
The result illustrates that different LY can be achieved by adjusting the WbLS components concentration
Summary
The Cerenkov radiation produced by a charged particle above the threshold can be used for particle identification and the reconstruction of its direction and energy [1]. All charged particles below the Cerenkov threshold are missed Detecting these belowthreshold particles is important for various applications, for example, in the search of the proton decay, in the p+ → K+] channel, where K+ is mostly below Cerenkov threshold and is invisible in a water detector. In either LS or WbLS, the isotropic scintillation light is produced by the charged particle energy deposition via ionization, but the scintillator components may interfere with the Cerenkov ring detection. WbLS potentially combines both the Cerenkov ring and scintillation light capabilities It can preserve the particle identification for the particles above the Cerenkov threshold and detect the charged particles below the threshold via the scintillation light.
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