Abstract
The available experimental data for the value of v for fissile and fertile isotopes is reviewed. The absolute determination of ν for 252Cf is discussed, since this provides the standard for normalizing the other values. Based on weighted averages of the experimental data, recommended 2200 m/sec values are presented for 235U, 233U, 239Pu and 241Pu. The available data relating the dependence of v on incident neutron energy is tabulated and straightline fits to this data are made by the method of least squares. These results are of direct value in reactor calculations and the related evaluation of nuclear cross sections. Although there are instances where the data indicate structure of a more complicated nature, no attempt is made to analyse these situations. For practical purposes, a reasonably satisfactory fit to the data can be made with not more than two straight lines.
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