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反应性是反应堆物理的一个基本而重要的物理量,本文总结了各种定义反应性的方法,指出了各种反应性定义的差异,并讨论了它们在什么条件下具有同一性与可测性。文中讨论了:在选择静态伴中子密度或中子价值作为权重函数以确定中子动力学方程的动态参数时,动力学反应性近似等于静态反应性。由于受归一化条件的限制、形状函数应作如此选择,使相应的幅度函数正比于中子密度基波随时间的变化。由于瞬发中子密度与缓发中子密度空间分布的不同以及高次谐波的影响,动态方法所测得的反应性将与探测器的位置有关。为得到真实的静态反应性须作相应的修正。
Reactivity is a basic and important physical quantity of reactor physics. In this paper, we summarize various methods of defining reactivity, point out the differences of various reactivity definitions, and discuss under what conditions they have identity and testability. It is discussed in the paper that the kinetic reactivity is approximately equal to the static reactivity when choosing the static neutron density or neutron value as the weight function to determine the dynamic parameters of the neutron kinetic equation. Due to the restrictions of the normalization conditions, the shape function should be chosen such that the corresponding amplitude function is proportional to the change of neutron density fundamental wave over time. Due to the different spatial distributions of instant neutron density and delayed neutron density and the effects of higher harmonics, the reactivity measured by the dynamic method will depend on the position of the detector. To obtain true static reactivity to be amended accordingly.