The problem of cosmic-ray rejection in low counting rate experiments involving a radioactive nuclear beam is considered. Two possible solutions, i.e. the use of plexiglas and silica aerogel as Cherenkov radiators, are presented.
Leleux, P., Licot, I., Lipnik, P., & Nuyens, C. (1993). On the Cosmic-ray Rejection Near a Radioactive Beam. Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 329(3), 518-520. https://doi.org/10.1016/0168-9002(93)91287-W (Original work published 1993)