Positron annihilation lifetime spectrometers
|Fast-slow γ-γ spectrometer|
FWHM: 200-210 ps (with small scintillators 150 ps obtained) at standard energy window setting.
HV - high voltage supply (~2 kV),|
START, STOP - BaF2 scintillators coupled to a photmultiplier tubes for 511 keV and 1274 keV γ photons detection,
AMP - amplifier,
SCA - single channel analyser,
CFD - constant fraction discriminator,
TAC - time-to-amplitude converter,
ANTIPILE-UP - antipileup electronics,
DEL - delay,
CC, CCCC - coincidence,
MCA - multi channel analyser.