The decay of 20Na: Measurements of isospin mixing and the weak vector coupling constant as well as other new decay data
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Kinematic shifts of particles from the + delayed decay of 20Na have been measured as a function of the energy of the coincident + particles. Beta-neutrino-alpha triple-correlation coefficients were determined for six + transitions from 20Na(J, T = 2+, 1) to excited 2+ states in 20Ne; ft values were also deduced. For the superallowed 2+ 2+ transition to the T = 1 analogue state in 20Ne the results yielded a measurement of the vector weak coupling constant, G'V/(c)3 = (1.1030.028) 10-5GeV-2. For the other five (allowed Gamow-Teller) transitions, limits were established for the vector (Fermi) component and, from them, limits deduced on isospin mixing amplitudes for the daughter states in 20Ne. Weak, previously unknown, -transitions were assigned to the decay of 20Na based on the observation of new groups and one new -transition. 1989.