Energy loss ofAg107,Ag109, andSm150in Ni and Au

The stopping po$\stackrel{\mathrm{´}}{\mathrm{w}}$er of ${}_{}{}^{107}{}_{}{}^{}\mathrm{Ag}$, ${}_{}{}^{109}{}_{}{}^{}\mathrm{Ag}$, and ${}_{}{}^{150}{}_{}{}^{}\mathrm{Sm}$ in nickel and gold was measured as a preliminary test of a new technique for measuring energy loss based on the $\gamma$-ray Doppler shift. The analysis of the data was based on the theories of Lindhard, Scharff, and Schiott for nuclear and electronic stopping. The results are compared with the semiempirical predictions of Northcliffe and Schilling and the Lindhard-Scharff-Schiott theory.