Study of relativistic projectile fission with CR-39 plastic stack

A technique has been developed to accurately measure angles of nuclear tracks in CR-39 stack. The standard deviations of the measurements are ≤0.0280 for zenith angle measurements and about 2.80 for azimuth angle measurements. This method can also provide a direct and precise charge measurement, whose charge resolution is ≤ 0.5e/√n for relativistic nuclei of 12≤Z≤50, where n is the number of track cones measured along the trajectory of a nucleus. This technique has been used to study the relativistic projectile fission of 1 GeV/amu Au. The paper describes the technique and some results of the study of relativistic Au projectile fission. (author)