Abstract
In order to suppress muon-induced background, veto detector is very important, even if the particle physics experiments are deployed underground. Owing to its high efficiency, low cost and low sensitivity to environmental gamma-rays, resistive plate chamber (RPC) is a good candidate for large-area underground cosmic-ray detectors. Based on the experiences and lessons from the RPC veto detector in Daya Bay neutrino experiment, an improved design has been proposed considering the extremely low muon flux, which results in underestimation of RPC layer detection efficiency in self-calibration. Additionally, allowing for the studies of 9Li/8He and fast neutrons, the tracking ability has been considered in design. Finally, an improved design of an RPC underground cosmic-ray detector has been achieved.
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