[问答题]
Give a reaction between two nu)+mm ni-) y-zgmw+bk tcleona as5i 7 g.y3hbumx*c1s, similar to Eq. 32-4, that could produce a ac1aibg5 hxs7 m*3.uy$\pi^0$.
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^- $
