首次报道￣（204）（n，￣3HE＋2Pn）￣（202）PT核反应截面的实验测量结果为1μb量级，证实了中子截面系统学研究结果的可靠性。实验中所用的快中子源（E＿n＝21MEV）是利用能量25MEV、流强10μA质子轰击1MM厚铍靶而产生的；反应产物放射性PT是通过化学分离法而得到的；γ能谱测量是采用低本底HPgEγ谱仪。The cross section of the reaction ￣(204)Hg(n,￣3He+2Pn)￣(202)Pt was measured For theFirst time to be abeut 1μb.The Fart neutrons( MeV)were produced by bombarding 1 mmthick,metallic beryllium plate with 25 MeV proton beam of 10 μA From the cyclotron.The radioiso-tope of the platinum was separated by chemical method.The γ-rays were detected by HPGe γ-ray spectrometer.国家自然科学基金和中国科学院所长基
