Cross Sections for Forward-Angle Elastic Scattering of 7.55 MeV Neutrons: A Survey
Cross Sections for Forward-Angle Elastic Scattering of 7.55 MeV Neutrons: A Survey

Author: C. E. Hollandsworth

Publisher:

Published: 1975

Total Pages: 26

ISBN-13:

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Forward-angle neutron elastic-scattering cross sections for Be, C, Al, Fe, Cu, Sn, and W at 7.55 MeV incident neutron energy are presented. The data are compared with both the ENDF/B III evaluations and optical model calculations. In the latter case good agreement between experiment and calculation is obtained for Al, Fe, Cu, and Sn when the Wilmore-Hodgson parameters are used in the optical-model calculation. Reasonably good agreement is found between the data and ENDF/B III, except for carbon and copper.

Cross Sections for Forward-Angle Elastic Scattering of 7 to 10 MeV Neutrons from Carbon, Nitrogen, and Oxygen
Cross Sections for Forward-Angle Elastic Scattering of 7 to 10 MeV Neutrons from Carbon, Nitrogen, and Oxygen

Author: William P. Bucher

Publisher:

Published: 1973

Total Pages: 23

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Absolute differential cross sections for the elastic scattering of 7.40, 7.55, 8.00, 8.55, 9.00, and 9.50 MeV neutrons from carbon, nitrogen, and oxygen in the angular range from 2.5 degrees to 15 degrees have been determined. Measurements were made relative to the scattering from lead by use of a special-purpose collimator. The cross section scale was then established by absolute measurements for lead in a ring geometry experiment. The results for nitrogen are consistent with recent measurements at other laboratories which suggest that the discrepancy in previous nitrogen cross section data around 7-8 MeV neutron energy arose from an underestimate of the elastic scattering cross section. The data presented in this report represent the first direct measurements of neutron scattering cross sections for light elements at very small scattering angles. (Author).

Small-Angle Elastic Scattering of 7.55 and 9.50 MeV Neutrons from C, N, and O.
Small-Angle Elastic Scattering of 7.55 and 9.50 MeV Neutrons from C, N, and O.

Author: William P. Bucher

Publisher:

Published: 1971

Total Pages: 41

ISBN-13:

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The calculation of neutron transport in air requires an accurate knowledge of the neutron cross sections for nitrogen and oxygen. Existing direct measurements of the total elastic cross section for nitrogen in the energy range from 6 to 10 MeV are in marked disagreement with the value deduced by taking the difference between the total cross section and the sum of all partial non-elastic cross sections. This discrepancy in the data previously available indicates an error in the total elastic measurement of approximately 30 percent or a 50 percent error in the total non-elastic cross section. A technique to measure differential cross sections for the small-angle (2 degrees to 15 degrees) scattering of fast neutrons has been developed and applied to a study of the scattering of 7.55 and 9.50 MeV neutrons from C, N, and O. The results obtained for nitrogen at 7.55 MeV yield differential cross sections 20 percent to 40 percent higher (at forward angles) than would be inferred from previous measurements and shows that at least 25 percent of the missing cross section should be assigned to the total elastic cross section. (Author).

A Note on the Small-Angle Elastic Scattering of Fast Neutrons from C, N, and O.
A Note on the Small-Angle Elastic Scattering of Fast Neutrons from C, N, and O.

Author: William P. Bucher

Publisher:

Published: 1971

Total Pages: 30

ISBN-13:

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The calculation of neutron transport in air requires an accurate knowledge of the neutron cross sections for nitrogen and oxygen. Existing direct measurement of the total elastic cross section for nitrogen is in marked disagreement with the value deduced by taking the difference between the total cross section and the sum of all partial non-elastic cross sections. This discrepancy in the available data indicates an error in the total-elastic measurement of 30% or in the total non-elastic cross section of 50%. A technique to measure differential cross sections for the small-angle (3 degrees to 15 degrees) scattering of fast neutrons has been developed and applied to a study of the scattering of 7.55 and 9.5 MeV neutrons from N, O, and C. Preliminary analysis of measurements obtained thus far show that the forward angle elastic scattering in nitrogen (theta