Physical design of positronium time of f light spectroscopy apparatus  

作　　者：姜小盼 张子良 秦秀波 于润升 王宝义 

机构地区：[1]Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS [2]Graduate University of Chinese Academy of Sciences [3]College of Applied Nuclear Technology & Automation Engineering, Chengdu University of Technology

出　　处：《Chinese Physics C》2010年第12期1890-1894,共5页中国物理C（英文版）

基　　金：Supported by NSFC (10835006, 60606011, 10705031)

摘　　要：Positronium time of flight spectroscopy（Ps-TOF）is an effective technique for porous material research.It has advantages over other techniques for analyzing the porosity and pore tortuosity of materials.This paper describes a design for Ps-TOF apparatus based on the Beijing intense slow positron beam,supplying a new material characterization technique.In order to improve the time resolution and increase the count rate of the apparatus,the detector system is optimized.For 3 eV o-Ps,the time broadening is 7.66 ns and the count rate is 3 cps after correction.Positronium time of flight spectroscopy（Ps-TOF）is an effective technique for porous material research.It has advantages over other techniques for analyzing the porosity and pore tortuosity of materials.This paper describes a design for Ps-TOF apparatus based on the Beijing intense slow positron beam,supplying a new material characterization technique.In order to improve the time resolution and increase the count rate of the apparatus,the detector system is optimized.For 3 eV o-Ps,the time broadening is 7.66 ns and the count rate is 3 cps after correction.

关 键 词：positronium time of flight spectroscopy （Ps-TOF） positron annihilation plastic scintillator timebroadening count rate 

分 类 号：O572.212[理学—粒子物理与原子核物理]