A MCP and Au-Si SBD TOF Detection System for Mass Measurement of Fission Fragments

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 α-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 (E_k=78 MeV, A_H=138~148 u) and (154:5±5:8) ps for the light fragments (E_k=102 MeV, A_L=101~111 u) can be obtained.