phys 102 – lecture 28 life, the universe, and everything 1
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Fundamental particles Are the electron, proton, and neutron the fundamental building blocks of matter? Particle “zoo” Neutron magnetic dipole moment Hundreds of particles identified in particle accelerator experiments “pion” π 0, π +, π – “kaon” κ 0, κ + “sigma” Σ 0, Σ +, Σ – “xi” Ξ 0, Ξ – etc... Neutron has spin ½, is electrically neutral, yet has a magnetic dipole moment! Indicates these are composite particles neutron Phys. 102, Lecture 28, Slide 3 Evidence says NO for proton & neutron