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在采用多单元大液闪球法测量239Pu(n,2n)反应截面时,由于裂变截面比(n,2n)反应截面大1个量级,其释放出的中子会对(n,2n)截面的测量造成很大影响,为扣除裂变中子的影响,我们采用裂变电离室和多单元大液闪球反符合的方法。实验测量时多层裂变电离室置于空心液闪球中心,由于239Pu有很强的α放射性,会产生严重的α堆积,
In the measurement of 239Pu (n, 2n) reaction cross section by multi-unit large liquid-flash ball method, the neutron released by the fission cross section ratio (n, 2n) The measurement of the cross-section has a significant impact. To eliminate the effect of fission neutrons, we used an anti-coincidence method for fission ionization chambers and multi-element LCFs. Experimental measurement of multi-layer fission ionization chamber is placed in the center of Hollow liquid-crystal ball, the 239Pu has a strong α-radioactivity, will have a serious accumulation of α,