Charge Distribution in the Fission of Uranium Isotopes Induced by 20-40 Mev Helium Ions

Abstract

The primary yields of ${\mathrm{Br}}^{82}$, ${\mathrm{I}}^{130}$, ${\mathrm{La}}^{140}$, ${\mathrm{Pr}}^{142}$, and ${\mathrm{I}}^{135}$ have been accurately determined for the mediumenergy (20-40 Mev) helium-ion-induced fission of ${\mathrm{U}}^{233}$, ${\mathrm{U}}^{235}$, and ${\mathrm{U}}^{238}$. These accurate primary yield data have been correlated with the constant-charge-ratio rule for nuclides away from the neutron shells and give a smooth, but different, distribution curve for nuclides of 83 neutrons.