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为了能很好地鉴别碎片质量,建立一个好的飞行时间测量方法是十分必要的.阐述了建立用于裂变碎片质量测量的微通道板(MCP)和金硅面垒探测器(SBD)飞行时间探测系统.对于80 μg/cm2厚的碳膜,241Am的α粒子的探测效率约为39%,252Cf(sf)裂变碎片的探测效率约为98%.在动能为78 MeV条件下,对252Cf(sf)重裂变碎片(138~148 u)得到的时间分辨为(224.1土6.1)ps;在动能为102 MeV条件下,对252Cf(sf)轻裂变碎片(101~111 u),得到的时间分辨为(154.5土5.8) ps.

In order to separate the mass number of fragments in the fission reactions,it is essential to develop a good time-of-flight (TOF) method.The purpose of this article is to set up a TOF detector system including a microchannel plate (MCP) and a Au-Si surface-barrier detector (SBD).The TOF system shows a detection efficiency of 39% for αc-particles released from 241Am and 98% for fragments in the spontaneous fission of 252Cf.The experimental results show that the time resolutions of (224.1 ± 6.1) ps for the heavy fragments (Ek =78 MeV,AH =138 ~ 148 u) and (154.5 ±5.8) ps for the light fragments (Ek =102 MeV,AL =101 ~ 111 u) can be obtained.

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