cse • paper_2 • nuclear_particle
[UPSC CSE 2013] Particle Physics (Q276, 15M)
In the following reactions indicate with an explanation, whether they proceed by strong, electromagnetic or weak interaction or they are forbidden:
(i) \pi^+ \longrightarrow \mu^+ + \nu
(ii) p \longrightarrow n + e^+ + \nu_e
(iii) p + \pi^- \longrightarrow K^+ + \Sigma^-
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