Z-identification of charged particles by signal risetime in silicon surface barrier detectors

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Abstract

The risetimes of the signals collected from totally depleted silicon surface barrier detectors have been measured and show strong dependence on the Z of the incident charged particles. This dependence has been observed for incident ions ranging from tritons to fluorine. A simple theoretical model has been used to predict the observed risetimes for ions whose range is long compared to the diameter of the ionization column which they produce in silicon. For particles with ranges short compared to the depletion depth of the detector it is found that the Z-dependence can be enhanced by allowing these ions to enter through the rear face of the totally depleted detector. For hydrogen and helium ions the dependence of the risetime on the mass M of the ion is also observed.

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