![]() It was thought that only two particles were emitted during beta-decay: an electron/positron and the daughter nucleus. Standard model particles plus#Initially, beta particles from beta plus and beta minus decay were also thought to be monokinetic. This is because the kinetic energies of the alpha particle and daughter nucleus formed from the decaying process must be specific to upload the laws of conservation of energy and momentum. How was the electron neutrino discovered?Ī He-4 nucleus produced from alpha decay is monokinetic, meaning its kinetic energy is constant for a given alpha decay. Muons were initially thought to be mesons (particles composed of two quarks) but were later corrected to be leptons because they do not interact with strong nuclear force (gluons). It was later confirmed that muons are approximately 200 times heavier than electrons. This suggested that the particle has a much greater mass than an electron (assuming they have the same charge of -1). The unknown particles were deflected to the same direction as electrons, but they were deflected to a lesser extent. This released a particle whose deflection trail was similar to that of an electron. ![]() Upon interacting with molecules inside the chamber, sub-atomic particles were produced from cosmic rays. Secondary cosmic rays consist of various sub-atomic particles including photons, leptons, hadrons (protons and neutrons), electrons, positrons, muons and pions.Īnderson and Neddermeyer applied a magnetic field to the cloud chamber which contained cosmic radiation.
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