Yields of Fission Products fromU238Irradiated with Fission Spectrum Neutrons

A radiochemical investigation of the fission yields of 15 products in the fission of ${\mathrm{U}}^{238}$ is described. The average energy of the neutrons effective in inducing fission is estimated as 2.8 Mev. The familiar twin-peaked yield-mass distribution is observed with a peak-to-trough ratio of 200 to 1. A comparison of the fission yield-mass curve for ${\mathrm{U}}^{238}$ with those for other fissile nuclei is made.