Research on Neutron Energy Spectrum of the Beryllium,Iron and Polyethylene Shells Assemblies Injected by D-T Neutron(In Chinese)

To test a simulation code,the multi-shell assemblies were established, which were made of beryllium,stainless steel and polyethylene from the interior to the outer.The symmetry axes are all in the line of the D~+ beam.The neutron energy spectra above 1 MeV were obtained in medium by the detector of stilbene crystal ofφ18 mm×20 mm.The distance between source and the spherical surface was 30 cm and 50 cm.The measurement channels are in the angle 0°and 120°relative to D~+ beam direction.The measurement positions are 0 cm, 9.7 cm,12.8 cm and 17.3 cm away from the center of the assembly in both directions. The spectrum in different positions of the multi-shell assemblies in medium were compared and analyzed.

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