Physics

Problem

Two reactions occur in quick succession inside a detector: 1.

n \;\longrightarrow\; p + e^{-} + \bar{\nu}_e

e^{-} + ^{64}_{29}\text{Cu}\;\longrightarrow\; ^{64}_{28}\text{Ni}+\;?

Which particle must be produced in the second reaction so that lepton number is conserved in that reaction and in the overall two-step process? a) a positron

\left(e^{+}\right)

b) an electron neutrino

\left(\nu_e\right)

c) an electron antineutrino

\left(\bar{\nu}_e\right)

d) a muon neutrino

\left(\nu_{\mu}\right)

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