A-LevelPhysicsParticle physics9702/12 · May/June 2018 · Q401 Mark
A neutron is composed of one up (u) quark and two down (d) quarks. When the neutron decays to a proton, there is β-emission. What is the change in the quark structure of the neutron due to the β-emission? (The symbol for a neutrino is νe and for an antineutrino is ν̄e.)
A→ u + β⁻ + ν̄e
B→ u + β⁻ + νe
Cu → d + β⁺ + νe
Du → d + β⁺ + ν̄e
✓ Correct answer
B: → u + β⁻ + νe
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