INNER BREMSSTRAHLUNG ACCOMPANYING THE NONUNIQUE 1ST FORBIDDEN BETA-DECAY OF CE-141

The inner Bremsstrahlung (I.B.) spectrum accompanying the beta-decay of Ce-141 (non-unique first forbidden beta-transition) was measured using a single channel scintillation spectrometer. The measured I.B. was analyzed by the variable width peeling-off method. This analyzed and corrected I.B. was compared with those calculated according to the original theories of Knipp and Uhlenbeck as well as of Bloch (KUB), the coulomb corrected theories of Lewis and Ford and of Nilsson, and according to detour-transition calculations of the Ford and Martin theory. Ths shape correction factor suggested by Konopinski and Uhlenbeck on the Fermi beta-decay theory was applied to the calculated I.B. based on Nilsson's theory (modified KUB theory). The experimental results are in better agreement with the modified KUB theory than the other theories.