一台高分辨同位素鉴别望远镜  

An Isotope Identification Detection System With High Resolution

作　　者：徐瑚珊[1] 卢俊[1] 李松林[1] 王琦[1] 殷旭[1] 范恩杰[1] 诸永泰[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《核电子学与探测技术》1996年第2期83-86,共4页Nuclear Electronics & Detection Technology

摘　　要：本文介绍了一套成功地用于深非弹激发函数测量实验的同位素鉴别探测系统，其中对反应产物质量数Ａ的鉴别采用的是飞行时间技术，对原子序数Ｚ的鉴别利用的是ΔＥ－Ｅ方法，飞行时间是通过两个ＰＰＡＣ来测量的，ΔＥ探测器为纵向电场气体电离室，Ｅ探测器为金硅面垒半导体探测器。测量结果得：ＰＰＡＣ的本征时间分辨δｔ约１４０ｐｓ，Ａ分辨Ａ／ΔＡ约５０和Ｚ分辨Ｚ／ΔＺ约３０。文中对作为定时探测器的ＰＰＡＣ作了较为详细的讨论。An isotope identification detection system used for DIC excitation function measurements is described. Todistinguish the atomic number Z and the mass number A of the reaction products, ΔE-E method and time-of-fl-ight technique were employed. The flight time was measured by two PPAC. ΔE was detected by a longitudinalelectric field type of gas-filled ionization chamber.The remaining energy was deposited in a surface barrier silicondetector. The eigen time resolution of 140 ps was reached for each PPAC. Z and A resolutions for tbe overall de-tection system were Z/ΔZ～30 and A/ΔA～50.In this paper,the PPAC served as the timing detectors andwas introduced emphatically.(

关 键 词：同位素鉴别 DIC TOF 定时 探测器 

分 类 号：O562.6[理学—原子与分子物理]