PHILIP ROSEN From Eqs. (29) and (30), we find R ADIOCHEMICAL studies of a wide variety of products resulting from the bombardment of bismuth with 340-Mev, 1 480-Mev, 2 and 660-Mev 3 pro-* Research performed under the auspices of the U. S. Atomic Energy Commission.f Now at

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It was demonstrated that the previously reported 1.8-hr Ce 145 and 4.5-hr Pr 145 do not occur among the uranium fission products. Ce 146 and Pr 146 were briefly reinvestigated: the former decays with a half-life of 13.9±0.6 minutes and emits 0-rays of 0.9-Mev maximum energy followed by soft Y-rays; the latter decays with a half-life of 24.4±0.5 minutes and its maximum /3-ray energy is 3.8 Mev. In addition, it was shown that any undiscovered short-lived Ce fission products must decay with half-lives shorter than 6 minutes.

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