Stopping powers of gases for heavy ions (O, Ar, Kr, Xe) at intermediate energy (20–100 MeV/u). Vanishing of the gas—solid effect

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Abstract

The stopping powers of eleven gaseous media have been measured for 20–85 MeV/u O, 25–60 MeV/u Ar, 20–40 MeV/u Kr and 25–30 MeV/u Xe ions. The experimental method consists of measuring the energy loss of ions traversing a given thickness of gas contained in a gas cell. The energy measurements are performed using a magnetic spectrometer (LISE). The pressure and temperature of the gases are directly measured by appropriate probes. The stopping powers are thus determined with an accuracy of ± 2% to ± 4%. From the comparison of these data with the stopping powers of solids previously measured, the magnitude of the gas-solid effect is estimated. This effect is still observed for 25 MeV/u Xe and vanishes for lighter projectiles at higher energy, when they tend to be fully stripped.

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Experiment performed at the GANIL National Facility in Caen (France).

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