Speaker
Dr
Bin Cheng
(University of Science and Technology of China)
Description
Positron lifetime - momentum correlation spectrometer (AMOC) is a important method to analysize material structures using positron annihilation technology. However a key problem of low count rates need to be tackled. A noval geometry and scintillator architectures with the AMOC spectrometer is designed to promote the spectrometer count rates. A well-shape BaF2 scintillator is employed to detect the 1.28MeV gamma photon emmitted while the generation of a positron, which improves the cross section by about three times. By placing the HPGE detector behind the photomultiplier tube in the line, HPGE detectecor can still capture the 0.511MeV gamma photon emmitted while the annihilation of a positron.A new hard trigger system is designed and utilized to reduce the dead time. The spectrometer with high efficiency is on debugging for better performance.
Primary author
Dr
Bin Cheng
(University of Science and Technology of China)
