Energy loss straggling of heavy charged particles in thick silicon absorbers

The energy loss straggling of heavy charged particles with relatively high energies passing through thick uniform Si detectors (1.0 mm–9.2 mm) has been studied in a wide range of the ratio Δ E / E 0 where Δ E is the energy loss and E 0 is the initial energy of the incident particles. The experimental results are compared with those predicted by straggling theories. It suggests that the measured distributions are in good agreement with those predicted from the Bohr's or Livingston-Bethe's theories when Δ E / E 0 0.3.