Measurement of β−-decay intensity distributions of several fission-product isotopes using a total absorption γ-ray spectrometer

A total absorption γ-ray spectrometer coupled to the 252Cf-based INEL ISOL facility has been used in a program of systematic study of the distributions of β−-decay intensities of fission-product radionuclides. Cascade-summed γ-ray spectra measured with the system have been compared with the spectrum simulated from the corresponding decay schemes, as a test of the completeness and correctness of these schemes. New β−-decay intensity distributions have been deduced for the decay of these radionuclides. Radionuclides which have been studied in this manner include 89Rb, 90gRb, 90mRb, 91Rb, 93Rb, 93Sr, 94Sr, 94Y, 95Sr, 95Y, 138gCs, 138mCs, 139Cs, 140Cs, 141Cs, 141Ba, 142Ba, 142La, 143Ba, 143La, 144Ba, 144La, 145Ba, 145La, 145Ce, 146Ce, 146Pr, 147Ce, 147Pr, 148Ce, 148Pr (2.0 min), 148Pr (2.27 min), 149Pr, 149Nd, 151Pr, 151Nd, 152Nd - 152Pm (4.1 min.), 153Nd, 153Pm, 154Nd, 154Pm (1.7 min), 155Nd, 155Pm, 156Pm, 157Pm, 157Sm, 158Sm, and 158Eu.