A-LevelPhysicsParticle physics9702/12 · May/June 2022 · Q401 Mark
A neutron is composed of one up (u) quark and two down (d) quarks. When a neutron decays to a proton, a beta-particle is emitted. What is the change in the quark structure of the neutron due to the emission of the beta-particle? (The symbol for a neutrino is νₑ and for an antineutrino is ν̅ₑ.)
A→ u + β⁺ + νₑ
B→ u + β⁻ + ν̅ₑ
Cu → d + β⁺ + νₑ
Du → d + β⁺ + ν̅ₑ
✓ Correct answer
B: → u + β⁻ + ν̅ₑ
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