Measurement of secondary neutron emission double-differential cross sections for ⁹Be induced by 21.65 ± 0.07 MeV neutrons

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• 关键词：Secondary neutron ; Double-differential cross sections ; Fast neutron TOF spectrometer ; Monte-Carlo method
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：375
• 期：Complete
• 页码：8-12
• 全文大小：1448 K

文摘

The neutron emission double-differential cross sections (DDX) of ⁹Be was measured at an incident neutron energy of 21.65 MeV, using the multi-detector fast neutron time-of-flight (TOF) spectrometer on HI-13 Tandem Accelerator at the China Institute of Atomic Energy (CIAE). The data were deduced by comparing the measured TOF spectra with the calculated ones using a realistic Monte-Carlo simulation. The DDX were normalized to n–p scattering cross sections which are a neutron scattering standard. The results of the elastic scattering angular distributions (DX) and the secondary neutron emission DDX at 25 different angles from 15 deg to 145 deg were presented. Meanwhile, a theoretical model based on the unified Hauser-Feshbach and exciton model for light nuclei was used to describe the double-differential cross sections of n+⁹Be, and the theoretical calculation results were compared with the measured cross sections.