Structure of detonation waves in PETN

A VISAR technique was used to study the structure of the reaction region in PETN for various initial densities and dispersion of samples. The flow in the pressed charges corresponds to the classical denotation model. In the case of bulk density, the properties corresponding to an explosive combustion model are determined. In the vicinity of the initial density of 1.7 g/cm$^3$, a kink is found on the curve showing detonation rate versus density, and the shock-wave initiation of PETN above and below the kink point is studied.