Stopping powers of gases for very heavy ions

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Abstract

The stopping powers of gases have been measured for incident 24 MeV/u 238U and 29 MeV/u 208Pb projectiles using the LISE spectrometer at GANIL. The results show the persistence of the 20% gas-solid effect observed at lower energy. The effective charges derived from these measurements depend on the atomic number of the target in a way very similar to that observed for solid degraders.

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Work performed at the GANIL national facility, Caen, France.

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