Abstract
The beta-spectrum shape factor and the beta-gamma directional correlation of the 7/2−(β)5/2 +2(γ)7/2 +2 cascade in the decay of 139Ba have been measured as a function of the beta-particle energy. Values of the four nuclear matrix elements of the beta-decay Hamiltonian are obtained from at least-squares fitting of the experimental data to the “exact” theoretical formalism, which implies numerical calculation of the electron wave function, including nuclear finite size and' finite de Brodlie wavelength effects. The experimental values of these matrix elements are compared to a theoretical evaluation on the basis of the j-j coupling model.
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