Download or read book Fission Cross Section Ratios for Sup 233,234,236 U Relative to Sup 235 U from 0. 5 to 400 MeV. written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron-induced fission cross section ratios from 0.5 to 400 MeV for samples of {sup 233, 234, 236}U relative to 235U have been measured at the WNR neutron Source at Los Alamos. The fission reaction rate was determined using a fast parallel plate ionization chamber at a 20-m flight path. Cross sections over most the energy range were also extracted using the neutron fluence determined with three different proton telescope arrangements. Those data provided the shape of the 235U(n, f) cross section relative to the hydrogen scattering cross section. That shape was then normalized to the very accurately known value for 235U(n, f) at 14.1 MeV to allow us to obtain cross section section values from the ratio data and our values for 235U(n, f). 6 refs., 1 fig.