The energy loss of relativistic cosmic ray muons in plastic scintillator

The energy loss for a small area plastic phosphor scintillation counter as a function of particle momentum has been investigated using the Durham Mk 3 Spectrograph with the intention of clarifying the position regarding the decrease in energy loss for particles of momenta greater than 10 Gev(_c) recently predicted "by Tsytovitch. The results0are consistent with the theory of Sternheiraer and show only a slight decrease in the momentum range 10 GeV(_c) to 100 GeV(_c) which is much less than that predicted by Tsytovitch.