The Total Scattering Cross-sections of Deuterium and Oxygen for Fast Neutrons
Author : Richard G. Nucholls
Publisher :
Page : 12 pages
File Size : 37,11 MB
Release : 1946
Category : Deuterium
ISBN :
Author : Richard G. Nucholls
Publisher :
Page : 12 pages
File Size : 37,11 MB
Release : 1946
Category : Deuterium
ISBN :
Author : David Bruce Fossan
Publisher :
Page : 178 pages
File Size : 16,46 MB
Release : 1961
Category : Beryllium
ISBN :
Author : G. D. Joanou
Publisher :
Page : 84 pages
File Size : 39,20 MB
Release : 1961
Category : Beryllium
ISBN :
Author : Henry Herman Barschall
Publisher :
Page : 28 pages
File Size : 24,42 MB
Release : 1946
Category : Fast neutrons
ISBN :
Author : Richard G. Nuckolls
Publisher :
Page : 216 pages
File Size : 13,82 MB
Release : 1946
Category : Neutrons
ISBN :
Author : Daniel Weber Miller
Publisher :
Page : 236 pages
File Size : 12,71 MB
Release : 1951
Category :
ISBN :
Author : H. Goldstein
Publisher :
Page : 51 pages
File Size : 15,49 MB
Release : 1962
Category :
ISBN :
A revision of the data for angular distributions for elastic neuton scattering in oxygen and deuterium is presented. The kinetics of the (n,2n) reaction in deuterium is discussed and a Monte Carlo scheme for generating the energy and direction of secondary neutrons is given. Complete sets of the cross sections for both materials are tabulated.
Author : William P. Bucher
Publisher :
Page : 30 pages
File Size : 11,93 MB
Release : 1971
Category :
ISBN :
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
Author : James DeJuren
Publisher :
Page : 24 pages
File Size : 22,60 MB
Release : 1950
Category : Bismuth
ISBN :
The total cross sections of twelve different elements were measured using the neutron beam from the 184-in. cyclotron, operating with deuterons. Bismuth fission ionization chambers were employed as both monitor and detector in conventional 'good geometry' attenuation measurements in the neutron flux emerging from the 3-in. diameter collimating port in the 10-ft-thick concrete shielding. The mean energy of detection of the neutrons in this experiment is estimated to be 95 Mev. Measurements were also made with a monitor and detector placed inside the concrete shielding where an intense neutron flux over a large area could be obtained. Attenuators of four different elements were placed in front of the detector in a 'poor geometry' arrangement so that attenuation was due essentially to inelastic collisions which degrade the neutron energy below the fission threshold. A second detector was placed outside the concrete shielding In the collimated neutron beam in line with the neutron source, absorber, and first detector. Attenuation in it is caused by both inelastic and elastic scattering. By this arrangement the ratio of inelastic to total cross section can be determined directly in one experiment. The nuclear radii as calculated from the observed cross section, using the theory of the transparent nucleus, vary as 1.38 x 10(exp-13) A(exp(1/3)) cm. In this energy range the ratios of the inelastic to total cross sections are all less than one-half.
Author : C. L. Bailey
Publisher :
Page : 28 pages
File Size : 48,66 MB
Release : 1946
Category : Fast neutrons
ISBN :