Stopping powers of havar for 1.6, 2.3 and 3.2 MeV/u heavy ions

Stopping powers of havar for Si-28,Si-30-, Ar-36-, Fe-54,Fe-56- and Kr-80,K r-84-ions with energies of 1.6, 2.3 and 3.2 MeV/u have been determined by a transmission technique. Sample foils are exposed to the direct beams. No p revious data for havar with these ions have been published. The obtained re sults are brought together with literature havar data for H-1-, He-4-, Li-7 -, B-11-, C-12-, N-14-, O-16- and I-127-ions at the same ion velocity. The experimental data are compared with the values predicted by the SRIM-2000 p arametrization using Bragg's rule. A systematic underestimation, by 6-23%, of the experimental stopping powers was observed. The empirical correction scheme of Thwaites has been applied to the stopping power values obtained b y the parametrization. The corrected values agree well with the present res ults. Also, the effective charge values of the various ions were deduced fr om the experimental set of data. (C) 2000 Elsevier Science B.V. All rights reserved.