Author: Henry Herman BarschallPublisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 28
Book Description
Measurement of Transport and Inelastic Scattering Cross Sections for Fast Neutrons
Author: Henry Herman BarschallPublisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 28
Book Description
Measurement of Transport and Inelastic Scattering Cross Section for Fast Neutrons
Author: A Note on the Small-Angle Elastic Scattering of Fast Neutrons from C, N, and O.
Author: William P. BucherPublisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
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
Fast Neutron Cross Section Measurements. Final Technical Report, March 1, 1987--September 30, 1995
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 90
Book Description
The time-of-flight technique was used with the ring scattering geometry in a laboratory with low neutron scattering background to measure the angular distributions of the cross sections for elastic and inelastic scattering of 14 MeV neutrons in natural chromium, iron, nickel, and niobium. Specifically for inelastic scattering included were: the 1.43 MeV and 4.56 MeV levels of 52Cr, the 0.85 MeV level, and (2.94-3.12) MeV and (4.46-4.51) MeV level groups of 56Fe, the 1.33 MeV level of 6°Ni combined with the 1.45 MeV level of 58Ni, and the 4.48 MeV level of 58Ni. Pulses of neutrons with time width of 0.9-1.1 ns were produced via the 3H(d, n)4He reaction in a 150 keV Cockcroft-Walton linear accelerator, with average intensities of 9x108 n/s. The energy of the incident neutrons was between 14.75 MeV (at 16°) and 13.48 MeV (at 160°). High purity scattering ring samples were used. The scattering angles ranged from (almost equal to)16° to (almost equal to)150°, for iron, chromium, and nickel, and from (almost equal to)16° to (almost equal to)160° for niobium, with a typical step of (almost equal to)10°. High purity ring samples were used.
Fast-neutron Scattering from Elemental Mo, Sn, Sb, and Te
Author: A. B. SmithPublisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 38
Book Description
Transport Analysis of Measured Neutron Leakage Spectra from Spheres as Tests of Evaluated High-energy Cross Sections
Author: Donald BogartPublisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 44
Book Description
The Status of Experimental Neutron Cross Sections for Energies Between 0.5 and 14.5 Mev
Author: Robert J. HowertonPublisher:
ISBN:
Category : Elastic scattering
Languages : en
Pages : 28
Book Description
Small-Angle Elastic Scattering of 7.55 and 9.50 MeV Neutrons from C, N, and O.
Author: William P. BucherPublisher:
ISBN:
Category :
Languages : en
Pages : 41
Book Description
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).
Nuclear Science Abstracts
Author: Fast Neutron Data
Author: Herman FeshbachPublisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 76
Book Description