^（204）Hg（n，~3He＋2Pn）^（202）Pt核反应截面的实验测量

The Measurement of the Cross Section of the Reaction ￣(204)Hg(n,￣3He+2Pn)￣(202)Pt

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.