Further Radiochemical Studies of the High-Energy Fission Products

Formation cross sections of various ${\mathrm{U}}^{238}$ fission products have been measured as a function of bombarding-particle energy, using protons (10-340 Mev) and deuterons (20-190 Mev). The reactions ${\mathrm{Al}}^{27}(p, 3pn){\mathrm{Na}}^{24}$ and ${\mathrm{Al}}^{27}(d, \ensuremath{\alpha}p){\mathrm{Na}}^{24}$ were used as monitoring reactions to measure effective cyclotron beam intensity. Fission-product distribution curves and total fission cross sections have been measured. Above 50-Mev bombarding energy, the fission-product distribution is not symmetrical about a given mass number at a given bombardment energy.