Neutron Scattering Cross Sections for Natural Carbon in the Energy Range 2-133 keV Page: 4 of 10
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measured data is absent. The 1.5 - 442 keV region was investigated by , the accuracy of
the obtained elastic scattering cross section lies within 5-10%.
The technique of neutron filtered beams developed at the Kyiv Research Reactor (KRR)
makes it possible to reduce the uncertainty of the experimental data and to measure the
neutron scattering cross sections on natural carbon in the energy range 2 - 149 keV with
accuracy 3-6%. Investigations of the elastic scattering cross section on carbon were carried
out using 5 neutron filters with energies 2, 3.5, 24, 54 and 133 keV.
Experimental investigation of the elastic scattering cross section for natural carbon was made
on the ninth horizontal channel (HC) at the KRR. Experimental installations on the HC
include the systems for forming filtered neutron beams, systems of radiation shielding,
sample management systems, detection and neutron counting systems. The experimental
layout is shown schematically in Fig. 1 (not to scale).
Figure 1.Teeprmetllyu8n h . C(ntt.cl) C ,CC adC
For e-vacuum Fore-vacuum BOX 2 H~ie3 - detector
Figure 1. The experimental layout on the 9th HC (not to scale). C1, C2, C3 and C4 -
collimators; F- filters; "A", "B", "C" - devices for placement of samples.
The neutron beam forming system includes the elements of beam collimation and neutron
filtration on the way from the reactor core to the investigated sample. The preliminary
forming of the necessary beam geometry is realized with two iron and boron carbide
collimators (C1 in Figure 1). Further beam forming takes place in the first three discs of the
shutter and in outer collimators (F, C2, C3 in Figure 1). The collimator materials are lead,
textolite and a combination of paraffin with H3B03 in that order. The collimation system
provided a beam narrowed to 20 mm, corresponding to a beam diameter at the investigated
sample of 25 mm.
The elements of the neutron filtration system take place in the first three disks of the shutter
and in the outer collimator (see Figure 2). To produce quasi-mono-energetic beams with
average energies of 2, 3.5, 24, 54 and 133 keV we used composite neutron filters, the
components of which are presented in Table 1. The filter component optimization was
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Gritzay, O; Gnidak, M; Kolotyi, V; Korol, O; Razbudey, V; Venedyktov, V et al. Neutron Scattering Cross Sections for Natural Carbon in the Energy Range 2-133 keV, article, June 14, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900768/m1/4/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.