大动态范围双维位置灵敏多叠层探测系统  

A Two-Dimensional Poeition Sensitive Multi-Stage Detection System with a Wide Dynamic Range for Heavy Ion Reaction

作　　者：王金川[1] 詹文龙[1] 郭忠言[1] 郗鸿飞[1] 周建群赵有雄 雷怀宏 罗永锋[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《高能物理与核物理》1996年第3期204-210,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;中国科学院"八五"重大课题资助.

摘　　要：描述了一种用于中能重离子核反应实验研究的大动态范围双维位置灵敏多叠层探测系统．该探测系统由纵向电场气体电离室（ＩＣ）、大面积双维位置灵敏穿透型Ｓｉ探测器（ＰＳＳＤ）、大面积Ｓｉ光敏二极管（ＳＰＤ）和用光二极管读出的１６单元ＣｓＩ（Ｔｌ）闪烁体探测器阵列组成．用ａ放射源２４１Ａｍ（５．４８６ＭｅＶ）测得的ＩＣ、ＰＳＳＤ的能量分辨率分别为３％和２．６％．在２５ＭｅＶ／ｕ４０Ａｒ诱发的核反应中，探测到的ａ粒子的能量动态范围为２—１３０ＭｅＶ，此探测系统清楚地分辨出Ｚ＝２到Ｚ＝２１的元素，对Ｚ＝１８的Ｚ分辨本领Ｚ／△Ｚ≈４４．５，位置分辨为０．８６±０．０３ｍｍ（ＦＷＨＭ）．A two-dimensional position sensitive multi-stage detection system with a wide dynamic range for heavy ion reaction has been developed. It consists of four parts: a gas filled axial ionization chamber(IC), a position sensitive silicon detector(PSSD)(45×45)mm, 400 μm), a large area PIN silicon photodiode(SPD) ((48×48)mm, 300μm) and the 16 element CsI(Tl) scintillation detector. The energy resolutions for IC and PSSD tested with α-source of 241 Am (5.486MeV) were 3% and 2.6% respectively. Fragments with Z values from Z=2 to Z=21 were identified in the reaction of 25MeV /u 40Ar+115In. The Z resolving power was Z/△Z≈44.5(FWHM) for Z=18. The position resolution of PSSD was (0.86± 0.03)mm (FWHM).And the energy dynamic range for a particles was about 2-130MeV.

关 键 词：粒子鉴别 纵向电场 能量分辨 重离子 核反应 

分 类 号：O571.1[理学—粒子物理与原子核物理]