discovery of the positron Carl Anderson (1932): Same, mass, spin of electron: opposite charge Deflection of particle in magnetic field in cloud chamber Predicted by Dirac’s eq: antimatter (anti-protons discovered in 1955) The neutrino and the weak force Spectrum of energy for emitted electrons Most electrons energy ‘missing’ Not accompanied by a photon Energy not conserved? Ang momentum not conserved? e.g. 1H3 2He3 + e → or no p+ + e- particle missing Wolfgang Pauli (1931):
Carl Anderson (1932): discovery of the positron Same, mass, spin of electron: opposite charge Deflection of particle in magnetic field in cloud chamber Predicted by Dirac’s eq: antimatter (anti-protons discovered in 1955) The neutrino and the weak force Spectrum of energy for emitted electrons Most electrons ‘missing’ energy Not accompanied by a photon Energy not conserved? Ang momentum not conserved? e.g. 1H3 → 2He3 + e or no p+ + e- Wolfgang Pauli (1931): particle missing
fintroduction-to-particle-physics2.docx