Measurement of higher-order corrections to stopping power for relativistic Ne, Ar, and Fe beams

Measurements of range of 600 MeV/amu ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$, and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ in a variety of absorbers have been made to test the accuracy of the higher-order Mott, Bloch, and polarization correction terms to the Bethe expression of stopping power. These corrections give an acceptable ($<2\mathrm{}\sigma$) fit to energies determined by time-of-flight methods. A dramatically improved ($<1\mathrm{}\sigma$) fit follows if the relativistic Bloch term has half its currently calculated magnitude.