Backscattering of neutrons and secondary gamma-rays from aluminum and lead slabs for 15-MeV neutrons.

概要

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To obtain neutron and secondary r-ray albedos for 15-MeV neutrons, spectral measure-ments of backscattered neutrons and r-rays from Al and Pb slabs were carried out for monodirectional beams of D-T neutrons using the associated particle method. In the experiment, an NE-213 scintillator was used for simultaneous measurement of the neutron and photon spectra with the aid of the pulse-shape discrimination technique. The obtained pulse height distributions were unfolded to energy spectra by the FERDO code.<BR>The accuracy of the measured spectra was examined using calculated results of the Monte Carlo code which was newly developed for the combined neutron and photon trans-port calculation. A fairly good agreement was obtained between the measured and cal-culated results, excluding some discrepancies which seemed to come from the inaccuracy in the cross section data used in the Monte Carlo calculation.<BR>The obtained neutron and photon data in this paper are very meaningful for the ref-erence data of the neutron and secondary r-ray albedo calculation. The experimental technique in this work is shown to be useful in measuring the backscattered neutrons and r-rays simultaneously for the incidence of D-T neutrons.
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