Y⁹¹ decays by the emission of a single beta-particle with a maximum energy of 1.54 Mev, while Cs¹³⁷ decays in two ways, (1) beta-decay (maximum energy=0.518 Mev) to Ba^137* followed by a gamma-transition to the ground state, and (2) beta-decay (maximum energy=1.2 Mev) directly to the ground state. Probably not more than 5 percent of the Cs¹³⁷ nuclei decay directly to the ground state. Conventional (allowed transition) Kurie plots of Y⁹¹ and the low energy group of beta-particles of Cs¹³⁷ display curvature which is concave toward the energy axis at high energies and concave upward at low energies. If it is assumed that Gamow-Teller selection rules govern the beta-process, the Fermi function F(Z,W) for allowed spectra must be multiplied by a factor G=(W²-1)+(W₀-W)² in a beta-transition for which there is a change of parity and for which the spin change is two units. If these conventional Kur

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fermi function group of betaparticles of gamowteller selection rules allowed transition kurie plots

J. S. Osoba,.The Forbidden Transition of Yttrium⁹¹ and Cesium¹³⁷. 76 (3),345–349.

J. S. Osoba,"The Forbidden Transition of Yttrium⁹¹ and Cesium¹³⁷" 76

J. S. Osoba,"The Forbidden Transition of Yttrium⁹¹ and Cesium¹³⁷"