Abstract
A study has been made of the variation of the peak absorption efficiency of a AuSi surface barrier detector with energy and depletion depth using monoenergetic beams of electrons and positrons. The results differ from those of previous work, in the sense that the present work shows a continuous decrease of peak efficiency with electron energy mainly because of scattering out of the detector. A slight difference between electron and positron detection has been observed. The positron curve shows a tail on the high energy side due to Compton scattering of the positron annihilation gamma rays.
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