Theoretical and experimental results on the resolving time of P.I.N. detectors in γ-γ coincidence experiments

A calculation of the resolving time one can obtain by the delayed coincidence method with a P.I.N. detector, is developed. The results show that submillimicrosecond time resolution can be obtained with a 2mm thick detector. Experimental results lead to 1.1 ns (FWHM) with a Co⁶⁰ source and 2.8 ns with a Na²² source. The broadening of the prompt spectrum is explained in term of the electronic system noise.