[问答题]
Give a reaction between two pq-2cjcoblxv n* vc *86-hy)z nuclelat -fl3hyqvifd80), ons, similar to Eq. 32-4, that could produce a v hl , -tq0)l83ifadfy$\pi^0$.
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^- $
