Abstract

Rutherford backscattering at two different angles on a multilayer target is used to measure the stopping powers of light ions in matter. This method has the advantage that no spectrum width determination is needed so that any error related to this procedure is avoided. Moreover it is almost insensitive to most of the sources of errors suffered by transmission stopping power measurements. This new method has been used to measure the stopping powers of magnesium for helium ions ( 3He and 4He) from 100 to 350 keV with an accuracy better than 10%.

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