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利用直径为60厘米的球形液体闪烁探测器测量了Pu240自发裂变放出瞬时中子数目v的几率分布Pv,其结果可用一宽度为σ=1.08的高斯分布表示。我们将测量结果与B.C.Diven,A.Hicks和J.W.Boldeman的结果进行了比较,我们的结果与J.Terrell半经验理论计算的高斯分布很好符合。根据文献[5]中给出Pu240自发裂变瞬时中子平均数v=2.154±0.028,得到球形液体闪烁探测器记录Pu240自发裂变中子的效率为0.759±0.011。The probability distribution of prompt neutron number from the spontaneous fission of Pu240 has been measured by use of a spherical liquid scintillation detector 60 em in diameter. The experimental distribution can be well represented by a Gaussian distribution with σ=1.08. This result was compared with the experimental results of B. C. Diven, A. Hicks and J. W. Boldeman, and is in agreement with the semi-emperical theoretical distribution given by J. Terrel. The absolute efficiency of the detector for the fission neutron of Pu240 has been found to be 0.759 ± 0.011, based on the average number of prompt neutrons per fission for spontaneous fission of Pu240 v=2.154±0.028[5].
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