Inner Bremsstrahlung Accompanying the Non-Unique First Forbidden ^-Decay of Ce

The inner Bremsstrahlung (I.B.) spectrum accompanying the /S-decay of 1 4 1 Ce (non-unique first forbidden /^-transition) was measured using a single channel scintillation spectrometer. The measured I.B. was analyzed by the variable width peeling-ofT 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 ß-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.