Beta Decay

according allowed angle angular antineutrino approximation assumed asymmetry B-decay beta calculated Chap charge combination components conservation consider correction Coulomb coupling constants cross depends determined Dirac direction discussed distribution effect electron emission emitted energy equal equation evidence example expected experiment experimental expressed fact factor Fermi field final follows forbidden ft values Gamow-Teller given gives half-life hand helicity implies interaction invariant involved known lepton magnetic mass matrix elements measured method momentum muon negative neutrino neutron nuclear nucleon nucleus observed obtain occur operator opposite parity particles physical pion polarization positive positrons possible probability proton ratio rays recoil relation respect rest reversal rotation scattering shape shown spectra spectrum spin ß decay Table theoretical theory transformations transition two-component units vector wave function zero