Two reactions occur in quick succession inside a detector: 1

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Two reactions occur in quick succession inside a detector: 1. n  ⟶  p+e−+νˉen \;\longrightarrow\; p + e^{-} + \bar{\nu}_e 2. e−+2964Cu  ⟶  2864Ni+  ?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 (e+)\left(e^{+}\right) (b) an electron neutrino (νe)\left(\nu_e\right) (c) an electron antineutrino (νˉe)\left(\bar{\nu}_e\right) (d) a muon neutrino (νμ)\left(\nu_{\mu}\right)

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