CsI(Tl)晶体探测WIMP实验中反冲核与电子信号的甄别

摘要

研究了CsI(Tl)晶体探测器中反冲核信号与电子信号的甄别能力.利用参数"tbar"来描述反冲核信号与电子信号两种脉冲波形的特性,并以此来甄别两种信号.对品质因子K的研究表明,脉冲甄别方法的甄别能力随反冲核信号与电子信号能量的降低而减弱.通过这一脉冲甄别方法,对于CsI(Tl)晶体探测器而言,可以区别反冲核信号与电子信号的最低的阈是25个光电子.%The capability of Pulse Shape Discrimination (PSD) for recoiled nuclei and electrons with CsI(Tl) crystal has been studied in this article. One parameter "tbar" was used to describe the property of the pulse shapes of recoils and electrons. The study of the quality factor K shows that the capability of PSD becomes weaker when the energies of events decrease, the lowest threshold of about 25 photoelectrons has been obtained for CsI(Tl) crystal detector by PSD.