  Ground-based composition measurements of high-energy cosmic rays can be
significantly improved by using the direct Cherenkov method. This technique
targets the Cherenkov light produced by the primary particle prior to its
production of an extensive air shower. With the appropriate time and angular
resolution, the direct Cherenkov photons can be separated from those produced
in the extensiveair shower. By utilizing the 0.15 degree angular and 2
nanosecond timing resolution of the very high energy gamma-ray telescope
system, VERITAS, the charge and energy of cosmic rays at TeV energies can be
identified on an event-by-event basis. Results from a preliminary search for
direct Cherenkov events are discussed.
