STOPPING POWERS OF CR-39 NUCLEAR TRACK MATERIAL FOR Z=1-14 IONS WITH 0.25-2.8 MEV U/

Experimental studies of the slowing down of H-1, He-4, Li-7, B-11, C-1 2, N-14, O-16, Na-23, Al-27 and Si-28 ions in CR-39 nuclear track etch material in the ion energy range 0.25-2.8 MeV/u are presented. The io n stopping powers obtained are compared to the predictions of two rece nt semiempirical models for calculating ion stopping powers. The predi ctions are found to clearly underestimate the observed stopping powers for Li-7, B-11, C-12, Na-23, Al-27 and Si-28 ions.