Search results for "Empirical correction"
showing 2 items of 2 documents
Stopping powers of havar and effective charge for 1.4–3.2 MeV/u 127I-ions
2000
Abstract Stopping powers of havar for 1.4–3.2 MeV/u 127 I-ions have been determined by the transmission technique using two geometrical arrangements. No previous data have been published for havar with this ion. The experimental data are compared with predictions obtained by using Bragg’s additivity rule with various parametrizations of the stopping power found in the literature. The values obtained by the parametrizations underestimate the experimental data by 5–11%. The empirical correction scheme of Thwaites yields values in rather good agreement with the present results, especially at energies above 1.9 MeV/u. The effective charges of the 127 I ions were also deduced from the experiment…
Stopping powers of havar for 1.6, 2.3 and 3.2 MeV/u heavy ions
2000
Abstract Stopping powers of havar for 28,30 Si-, 36 Ar-, 54,56 Fe- and 80,84 Kr-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 previous data for havar with these ions have been published. The obtained results are brought together with literature havar data for 1 H-, 4 He-, 7 Li-, 11 B-, 12 C-, 14 N-, 16 O- and 127 I-ions at the same ion velocity. The experimental data are compared with the values predicted by the SRIM-2000 parametrization using Bragg’s rule. A systematic underestimation, by 6–23%, of the experimental stopping powers was observed. The empirical correction scheme of Thwaites has b…