The statistical fluctuations in energy loss have been measured for O, Si, and S ions, in varying thicknesses of polyethylene naphthalate ͓PEN, or ͑C 7 H 5 O 2 ͔͒ polymeric foils. The measurements have been performed in the fractional energy-loss limits ⌬E / E ϳ 5-90 %. These fluctuations have been found to be enhanced with an increase in ⌬E / E. Such a behavior has been reproduced by Bethe-Livingston formulation after modifying it suitably.
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