By the principles of the electric charge conservation, the mass conservation, the energy conservation and the momentum conservation in the nuclear reaction, threshold can be calculated with the methods of primary physics and can be applied to various collision types.
遵循核反应中的电荷守恒、质量守恒、能量守恒、动量守恒,用初等物理的方法也可求解阈能,并适用与各种不同的碰撞类型。