Passing mass separated recoil fission particles through a $\Delta E \mathrm{Si}$-surface barrier detector the nuclear charge distributions of fission products were measured in the mass chains 79 to 100. The average nuclear charge as well as the second, third, and fourth moment of the nuclear charge distribution reveal odd-even and shell effects.

NUCLEAR REACTION, FISSION ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n_{\mathrm{th}},f)$, measured nuclear charge distribution of $A=79\mathrm{}$ to $A=100\mathrm{}$, deduced element and isotone yields, proton and neutron odd-even effect.

• Received 14 January 1976

DOI:https://doi.org/10.1103/PhysRevC.14.1864