Triple coincidence PALS setup based on fast pulse digitizers

11th International Workshop on Positron and Positronium Chemistry

物理学;化学

Bosnar, D.^1 ; Urevi, B.^1 ; Paveli, L.^1 ; Bosnar, S.^2

Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia^1

Division of Materials Chemistry, Ruder Bokovi Institute, Zagreb, Croatia^2

关键词: Digitizers;    Energy information;    Evaluation board;    Off-line analysis;    Positron annihilation lifetime spectroscopy;    Three-gamma annihilation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/618/1/012044/pdf
DOI  :  10.1088/1742-6596/618/1/012044

来源: IOP

【 摘 要 】

We have assembled positron annihilation lifetime spectroscopy system that consists of three BaF2detectors with XP2020URQ PMTs which are directly coupled to DRS4 evaluation board. Both time and energy information of the detected gamma rays are reconstructed. In the off-line analysis, by using selected cuts on energies of gamma rays, double, as well as triple coincidence events can be extracted. The setup is very suitable for the determination of contributions of positronium three gamma annihilations which can be of interest in the investigations of various porous materials.