Performance of the low pressure MWPCs for f ission fragments under a high background  

作　　者：宋玉收 Margaryan A. 胡碧涛 唐力光 

机构地区：[1]College of Nuclear Science and Technology,Harbin Engineering University [2]Yerevan Physics Institute [3]School of Nuclear Physics and Technology,Lanzhou University [4]Thomas Jefferson National Accel.Facility [5]Department of Physics,Hampton University

出　　处：《Chinese Physics C》2011年第8期758-762,共5页中国物理C（英文版）

基　　金：Supported by Fundamental Research Funds for Central Universities (HEUCF101501);Fundamental Research Funds of Harbin Engineering University (002150260713);National Natural Science Foundation of China (10575046)

摘　　要：Two couples of low pressure multi-wire proportional chambers （MWPC） were located in the target chamber to detect fission fragments in a hypernuclei producing experiment at Thomas Jefferson National Laboratory （Jlab）. In the experiment, a continuous wave （CW） electron beam was applied to form hypernuclei by electromagnetic interaction. In the target chamber, the high energy （1.853 GeV） and high intensity （500 nA） primary electron beam caused a high particle background, which influenced the detection of the fission fragments. This report described the design of the MWPCs and studied the fission-fragment detecting performance of them under such a high background. The efficiency of the MWPCs was given with the help of a high resolution kaon spectrometer. At the same time, the background particles were discussed with a Monte Carlo code based on GEANT4.Two couples of low pressure multi-wire proportional chambers （MWPC） were located in the target chamber to detect fission fragments in a hypernuclei producing experiment at Thomas Jefferson National Laboratory （Jlab）. In the experiment, a continuous wave （CW） electron beam was applied to form hypernuclei by electromagnetic interaction. In the target chamber, the high energy （1.853 GeV） and high intensity （500 nA） primary electron beam caused a high particle background, which influenced the detection of the fission fragments. This report described the design of the MWPCs and studied the fission-fragment detecting performance of them under such a high background. The efficiency of the MWPCs was given with the help of a high resolution kaon spectrometer. At the same time, the background particles were discussed with a Monte Carlo code based on GEANT4.

关 键 词：MWPC fission fragment BACKGROUND detecting performance 

分 类 号：O572.212[理学—粒子物理与原子核物理]