A-LevelPhysicsParticle physics9702/12 · Feb/Mar 2018 · Q401 Mark
An isolated neutron decays to produce a proton, a β⁻ particle and an antineutrino. Which row gives the quark composition of the neutron and the proton and the type of force that gives rise to this reaction?
Aquark composition neutron: down, down, up, proton: down, up, up, type of force: strong interaction
Bquark composition neutron: down, down, up, proton: down, up, up, type of force: weak interaction
Cquark composition neutron: down, up, up, proton: down, down, up, type of force: strong interaction
Dquark composition neutron: down, up, up, proton: down, down, up, type of force: weak interaction
✓ Correct answer
B: quark composition neutron: down, down, up, proton: down, up, up, type of force: weak interaction
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