[问答题]
Give a reaction between two nucleons, similar to Eq-hw:y cpn ra6:znuf3):et)lftl ( n)d. 32 v6xcar:o5,htr6i;..dp exe z-4, that could produce a zd ;a6pv5xxre.t6. h : ocer,i$\pi^0$.
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^- $
