Four nuclei of the type discussed by Wigner, containing one more proton than neutron, have been produced. The nuclei, their half-lives and positron energies are: P²⁹, 4.6 seconds, 3.63 Mev; S³¹, 3.2 seconds, 3.85 Mev; Cl³³, 2.4 seconds, 4.13 Mev; and A³⁵, 2.2 seconds, 4.38 Mev. These energies are in excellent agreement with the calculated values and indicate that (1) the π-π force is equal to the ν-ν force plus the Coulomb repulsion, (2) the nuclear volumes are proportional to the atomic weights, and (3) the nuclear charge is distributed uniformly through the volume. The half-life-energy relation is in good agreement with the Fermi theory. Deviations are in the direction anticipated by the Gamow-Teller modification.
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White et al. (1941) studied this question.