Detection of Positrons through Silicon Avalanche Diodes and Its Application to β⁺-γ Coincidence Positron Lifetime Measurement

Abstract

Silicon avalanche diode was tested as new fast detector for positron annhilation experiments. The timing signal is initiated by a positron passing directly through an avalanche diode. Obtained time resolution is comparable to that obtained with a conventional plastic scintillator and photomultiplier tube. A β⁺-γ coincidence positron lifetime spectrometer was constructed by using an avalanche diode as the detector for start signal and an excellent time resolution, 240 Ps (FWHM), for the total system was accomplished.