中文摘要：

在兰州充气谱仪上，设计安装了一套新的焦平面探测系统，该系统包括飞行时间（TOF）探测器、盒型硅（Si-box）探测器阵列和反符合（Veto）探测器3部分。Si-box探测器阵列是由3块位置灵敏硅探测器（PSSD）和8块周边硅探测器（SSD）构成，它对注入核的α衰变的探测效率达到80％左右。Si-box探测器阵列与TOF探测器关联可以有效区分注入信号和α衰变信号。Veto探测器与Si-box探测器阵列和TOF探测器关联可以反符合掉高能轻粒子对注入信号和α衰变信号的干扰。简要介绍了PSSD的能量和位置刻度方法。这套探测器系统已经应用于^40Ca＋^175Lu和40Ca＋169Tm的实验。实验结果表明，该探测器系统具备很好的本底抑制能力，能够给出干净的α衰变能谱，结合能量-时间-位置关联测量方法可以实现对单原子的探测和鉴别，总体上达到了预期的设计要求。

英文摘要：

A new designed focal plane detection system was mounted at the gas-filled recoil separator at Institute of Modern Physics, Chinese Academy of Sciences, which consisted of a time-of-flight （TOF） detector, a silicon-box （Si- box） detector array and a silicon veto detector. Three position sensitive silicon detectors （PSSD） were. surrounded by eight side silicon detectors （SSD） without position sensitive, forming a box of the detector open from the front side. The detection efficiency for α-decays of implanted nuclei was about 80%. The anticoincidence condition for the signals from the TOF detector and Si-box detector array was used to distinguish between the pulses originating from the implanted nuclei and their α-decays. The veto detector information was used to discriminate events due to high-energy charged particles. External energy calibration and position calibration of PSSD are described concisely in this work. This system has been used in experiments of 40Ca＋175Lu and 40Ca＋169Tm. Clean α-decay spectra obtained in these reactions indicated the detection system has a good performance in background suppression. Evaporation residues can be identified by the energy-time-position correlation method. On the whole, the new designed focal plane detection system has achieved the design requirements.