Neutron Scattering Cross Sections ofU233,U235, andPu241from 1 to 30 eV

Scattering cross sections for ${\mathrm{U}}^{233}$, ${\mathrm{U}}^{235}$, and ${\mathrm{Pu}}^{241}$ have been measured for neutron energies between 1 and 30 eV, using the $4\pi$ neutron source technique. For ${\mathrm{Pu}}^{241}$, the scattering cross section and published fission data have been simultaneously fitted with Reich and Moore's multilevel formula. A good fit to both cross sections was obtained after allowing a sizable fluctuation in the resonance capture widths. Spin assignments were made for all observed resonances in the 2-32-eV interval. The average fission width for the $J=2\mathrm{}$ levels is 510 MeV and for the $J=3\mathrm{}$ levels is 190 MeV, in accordance with the spin-fission width correlation predicted by the Bohr-Wheeler theory.