U-235 Neutron Fission Cross Section from 0. 1 to 20. 0 MeV.
U-235 Neutron Fission Cross Section from 0. 1 to 20. 0 MeV.

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Published: 1977

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The status of the U-235 fast neutron fission cross section is discussed based primarily on material contributed and considered at the NEANDC/NEACRP Specialists Meeting on Fast Neutron Fission Cross Sections held at Argonne National Laboratory in June 1976. However, some newer measurements and evaluations are discussed as well. Specifically, recent measurements at ANL over the energy range 0.2 to 8.2 MeV, using several BND's, are reported. Data from the last 10 years are found to be in good agreement with an evaluated average of these data. Suggested problem areas are investigated in terms of their actual significance. It is found that the presently suggested version of ENDF/B-V for the U-235 (n, f) cross section does not represent the data base well and a reconsideration is recommended.

Fission Cross Section Ratios for Sup 233,234,236 U Relative to Sup 235 U from 0. 5 to 400 MeV.
Fission Cross Section Ratios for Sup 233,234,236 U Relative to Sup 235 U from 0. 5 to 400 MeV.

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Published: 1991

Total Pages: 5

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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.

Measurements of the Neutron-induced Fission Cross Sections of 24°Pu and 242Pu Relative to 235U. [0. 02 to 30 MeV, Tables].
Measurements of the Neutron-induced Fission Cross Sections of 24°Pu and 242Pu Relative to 235U. [0. 02 to 30 MeV, Tables].

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Published: 1976

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A continuation is given of the fission-cross-section ratio measurements in progress at the Lawrence Livermore Laboratory. Preliminary results are provided for the 24°Pu/235U and 242Pu/235U ratios from 0.02 to 30 MeV and 0.1 to 30 MeV, respectively. Using the threshold-cross-section method, the ratios were normalized to the values 1.368 +- 0.030 and 1.116 +- 0.025, respectively, from 1.75 to 4.00 MeV.

Measurement of the Neutron-induced Fission Cross-section of 243Am Relative to 235U from 0. 1 MeV to 30 MeV.
Measurement of the Neutron-induced Fission Cross-section of 243Am Relative to 235U from 0. 1 MeV to 30 MeV.

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Published: 1977

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Continuing studies of fission cross-section ratios at Lawrence Livermore Laboratory have led to the measurement of the 243Am/235U fission cross-section ratio from 0.1 to 30 MeV. A value of 1.429 +- 0.037 was obtained for the average cross-section ratio from 1.75 to 4.00 MeV by use of the threshold method. 2 figures, 1 table.