A.I. Kalinin

Timing system for Ge(Li) detectors

Abstract A timing system for coincidence and nuclear lifetime measurements with Ge(Li) detectors is described. The timing discriminator, based on the ARC-principle, is designed using integrated circuits. Uncompensated pulses from low energy events near the threshold of the timing discriminator are eliminated by a special internal coincidence circuit. Output pulses caused by noise, are excluded by duration discrimination. The detector signals are amplified by a preamplifier and a fast amplifier with 2.5 and 3.5 ns risetimes, respectively. The time resolution has been obtained 15.6, 2.7 and 1.1 ns fwhm for energies 50, 511 and 1330 keV, respectively, by using a planar detector (1.9 cm 3 ) with a collection time of 40 ns. The differential peak shift in the range from 10 to 1330 keV was 1.2 ns.

Timing System for Ge(Li)-Detectors

A timing system for coincidence and nuclear lifetime measurements with Ge(Li)-detectors is described. The timing discriminator, based on the ARC-principle, is designed using integrated circuits. Uncompensated pulses from low energy events near the threshold of the timing discriminator are eliminated by a special internal coincidence circuit. Output pulses caused by noise, are excluded by duration discrimination. The detector signals are amplified by a preamplifier and a fast amplifier with 2.5 and 3.5 nsec risetimes,respectively. The time resolution has been obtained 15.6 , 2.7 and 1.1 nsec FWHM for energies 50, 511 and 1330 keV, respectively, by using of a planar detector (1.9 cm3) with a charge collection time of 40 nsec. The differential peak shift in a range from 10 to 1330 keV was 1.2 nsec.

Timing in fission fragment detection at high alpha-background

Abstract The ionisation multiplate fission chamber working together with a fast low-noise level preamplifier, is described. Fission fragments were registered with an efficiency of about 50% at a background of 10 8 α/s. The timing characteristics are illustrated by the time distributions of fission events measured at the μ − beam of 680 MeV synchrocyclotron, JINR Dubna.