[问答题]
Give a reaction between two nucleons, similar to Eq. 32-4, thati-*vo + 5giorime tk.,jp)r1 c 44/2rmpzgaiz could produce a j r 24zr4)iz1pcpa/gm$\pi^0$.
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^- $
