加速器中子活化实验是核专业本科实验教学中的重要实验之一. 本文在利用14 MeV 快中子辐照238 U 诱发裂变截面实验过程中引导学生挖掘实验数据，测量了裂变核素( 89 Rb)的重要核参数—半衰期. 本工作运用低本底HPGe ! γ 谱仪测定裂变产物的一系列γ 射线能谱，解谱得到89 Rb 的特征γ 峰计数，从而确定89 Rb 的半衰期. 数据分析中应用89 Rb 核素两条γ射线分别独立得到89 Rb 的半衰期为15.30±0.09 min 和15.25±0.07 min. 测量结果在与文献数据符合较好的基础上，提高了测量精度.

Neutron activation experiment is one of the important experiments in undergraduate experimental education. For further guiding students to dig experimental data，the half-life of fission nuclide ( 89 Rb)is measured simultaneously. In this paper，the fission reaction of 238 U induced by 14 MeV fast neutrons is carried out. The γ-ray energy spectrum of the fission products is determined by a low background HPGe ! γ spectrometer，and the half-life of 89 Rb is determined. In the data analysis，the two gamma rays of 89 Rb nuclide are independently used to obtain the half-life of 89 Rb of 15.30±0.09 min and 15.25±0.07 min. The measurement results are in good agreement with the data reported in the literature. This work improves the accuracy of the half-life of 89 Rb.