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Two-nucleon systems such as the deuteron, the nucleus of a deuterium atom, as well as protonâproton or neutronâproton scattering are ideal for studying the NN force. Such systems can be described by attributing a potential (such as the Yukawa potential) to the nucleons and using the potentials in a Schroedinger schrÃ¶dinger. equation
Muon. The muon is a lepton which decays to form an electron or positron. The fact that the above decay is a three-particle decay is an example of the conservation of lepton number; there must be one electron neutrino and one muon neutrino or antineutrino in the decay.