We focus on the formulae currently used to calculate the total charge-changing cross sections (${\sigma }_{cc}$), these formulae assume that the contribution of the projectile neutrons to the total charge-changing cross sections is small. We show that the dependence of the charge-changing cross sections on the projectile neutrons is strong as its dependence on the projectile protons. We estimate the contribution of the projectile neutrons to the total charge-changing cross sections to be about 40%, so neglecting the projectile neutron density in calculating ${\sigma }_{cc}$ may not be adequate. Furthermore, we propose an empirical formula to evaluate the total charge-changing cross sections.

中文翻译：

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子弹中子对总电荷变化截面的贡献

我们关注当前用于计算总电荷变化截面的公式（${\sigma }_{CC}$），这些公式假定弹丸中子对总电荷变化截面的贡献很小。我们表明，电荷变化截面对射弹中子的依赖性很强，因为其对射弹质子的依赖性。我们估计弹丸中子对总电荷变化截面的贡献约为40％，因此在计算中忽略了弹丸中子密度${\sigma }_{CC}$可能还不够。此外，我们提出了一个经验公式来评估总的电荷变化截面。