A New Approach to Timing: The Fast-Fast System

Abstract

A dual channel constant fraction timing discriminator incorporating multiple energy windows and coincidence logic has been developed. Incorporation of energy discrimination and fast coincidence logic into Che timing channel has distinct advantages in terns of system simplicity, stability and data rates. A prototype applying Che F 2 approach has been constructed and tested. The system gives a Co 60 FWHM of i 210 psec at a singles rate of > 7.5 x tO 5 sec* 1

Half lives of the 482.2 keV and 615.3 keV levels in181Ta

“…Measurements of nuclear-level half lives in the nanosecond region are particularly dependent on the timepick-off process [38][39][40]. The accurate definition of the time of appearance by even a very modern electronic time-pick-off unit can still be disturbed by jitter, walk and drift phenomena [40][41][42][43].…”