Abstract
The stopping power of C, Ag and Au for Pb208 atoms recoiling from alpha decay with an energy of 169 keV was obtained by a time-of-flight technique yielding the energy distribution of these recoil atoms after their passage through thin foils. The theory ofBiersack (Thomas-Fermi-Firsov potential) and ofLindhard, Scharff andSchiott (Thomas-Fermi-Bohr potential) gives an adequate description of the results including the stopping of heavy particles by heavy target atoms. Our values of the stopping power agree with theoretical results within a factor of 1.5 just as the measurements of other authors in the same energy range. However these results for light target atoms are smaller than theory, whereas our measurements are greater by about the same amount. Simplifying asumptions of theory especially concerning the interaction potential may be the reason of these deviations.
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