Correction to the results of absolute measurments of the235U fission cross section with 1.9 and 2.4-MeV neutrons

Technical University, Dresden.     

236U total neutron cross section in the energy range 1.8-734 keV

Institute of Nuclear Research, Academy of Sciences of Ukraine. Translated from Atomnaya Énergiya, Vol. 75, No. 5, pp. 396-398, November, 1993.     

A measurement of the U233, U235, Pu239 total cross sections. As well as the fission cross section of U235 for resonance neutrons

The measurement of the interaction cross sections between resonance neutrons and fissionable isotopes are of definite importance both for reactor calculations and for the construction of various nuclear models. In this work we present the results of measurements of the U²³³, U²³⁵, and Pu²³⁹ total cross sections, as well as the fission cross section of U²³⁵. The measurements were performed on a mechanical neutron spectrometer (neutron chopper) with a resolution of 0.1–0.2 sec/m in the neutron energy region from 3–5 to about 500 ev. The resonance parameters are calculated to energies of about 30–50 ev, for which the levels may still be considered resolved. For these resonances the neutron widths g_n are determined; the total widths are determined for sufficiently excited levels when the uncertainty in this determination is no greater than about 50%. For U²³⁵ resonance in the energy region from 2.5 to 20 ev, in addition to the above parameters, the ratio of the fission width _f to the total width is found.     

Measurements of the fission cross section ratios232Th/235U and234U/235U for 0.13–7.4 MeV neutrons

Power Physics Institute (FÉI). Translated from Atomnaya Énergiya, Vol. 71, No. 4, pp. 320–325, October, 1991.