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在相对裂变碎片运动中的0°和180°方向上,用飞行时间方法测量了~(252)Cf自发裂变中子谱。实验测量是用具有高角度分辨率和时间分辨率的多参数飞行时间测量系统完成的。实验结果表明:在质心系中,在裂变中子谱的低能端存在着不对称的“前冲”和“后冲”的分布,这是中子非平衡发射的证据。
The ~ (252) Cf spontaneous fission neutron spectrum was measured by time-of-flight method in 0 ° and 180 ° directions relative to the motion of fission fragments. Experimental measurements were made using a multi-parameter time-of-flight measurement system with high angular resolution and temporal resolution. The experimental results show that in the centroid system, there exists an asymmetrical distribution of “frontier” and “backlash” at the low energy end of the neutron spectrum, which is evidence of the non-equilibrium neutron emission.