本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
Occasionally, the $\pi^+$ will decay by the following reaction: $\pi^+ \to e^+ + \nu_e$. Which of the four forces in nature is responsible for this decay? How do you know?
参考答案:
The reaction $ \Lambda^0 \to \text{p}^+ + \text{e}^- + \bar{\nu}_\text{e} $ proceeds via the weak force. We know this is the case since a neutrino is emitted.
本题详细解析:
暂无
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