[问答题]
Give a reaction betweena*al(0nur.cbm 5zb9 f two nucleolor+t xdg2f7v6 9;rta y 1 sh3xnti2a(ns, similar to Eq. 32-4, that could produce a vofx+h g2n(1 i3x2;dt r67 tay9tr las$\pi^0$.
参考答案: A reaction between two nucleons that would produce a $\pi^-$ is: $ \text{p} + \text{n} \to \text{p} + \text{p} + \pi^- $
