14.7-Mev Neutron-Induced Fission ofU238

Abstract

Fission yields of twelve mass chains from 14-Mev neutron-induced fission of ${\mathrm{U}}^{238}$ were measured with the following results: $A=89, 2.0\%; 90, 3.4\%; 91, 2.16\%; 111, 0.6\%; 113, 0.6\%; 131, 2.7\%; 132, 4.5\%; 133, 2.6\%; 134, 4.7\%; 135, 5.0\%; 139, 4.4\%; 140, 4.3\%$. Fine structure in the mass yield curve in the region $A=131-135\mathrm{}$ was observed with a distinct peak at $A=132\mathrm{}$. This data can be explained at least qualitatively by the method proposed by Pappas and agrees with the fine structure observed by Ashizawa and Kuroda for ${\mathrm{U}}^{238}$ spontaneous fission.