Energy-Loss-Straggling Experiments with Relativistic Heavy Ions in Solids

Abstract

Energy-loss straggling measurements performed at the high-momentum-resolution magnetic spectrometer FRS with bare and highly charged ${}_{8}\mathrm{O}$, ${}_{54}\mathrm{Xe}$, ${}_{79}\mathrm{Au}$, and ${}_{92}\mathrm{U}$ ions with specific kinetic energies (700--1000) MeV/u are reported. The results are in good agreement with rigorous calculations recently reported by Lindhard and S\o{}rensen and reveal systematic deviations from the well-known relativistic Bohr formula, which was obtained within the framework of the first-order Born approximation.