Measurement and simulation of the leakage neutron spectra from Fe spheres bombarded with 14 MeV neutrons  

作　　者：Qi Zhao Yang‑Bo Nie Yan‑Yan Ding Shi‑Yu Zhang Jie Ren Kuo‑Zhi Xu Xin‑Yi Pan Xi‑Chao Ruan 

机构地区：[1]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China [2]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China

出　　处：《Nuclear Science and Techniques》2023年第12期17-29,共13页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China (No. 11775311)。

摘　　要：Iron is commonly used as a structural and shielding material in nuclear devices. The accuracy of its nuclear data is critical for the design of nuclear devices. The evaluation data of ^(56)Fe isotopes in the latest version of the CENDL-3.2 library from China was significantly updated. This new data must be tested before it can be used. To test the reliability of this data and assess the shielding effect, a shielding benchmark experiment was conducted with natural Fe spherical samples using a pulsed deuterium–tritium neutron source at the China Institute of Atomic Energy(CIAE). The leakage neutron spectra from the natural spherical iron samples with different thicknesses(4.5, 7.5, and 12 cm) were measured between 0.8 and 16 MeV after interacting with 14 MeV neutrons using the time-of-flight method. The simulation results were obtained by Monte Carlo simulations by employing the Fe data from the CENDL-3.2, ENDF/B-VIII.0, and JEDNL-5.0 libraries. The measured and simulated leakage neutron spectra and penetration rates were compared, demonstrating that the CENDL-3.2 library performs sufficiently overall. The simulation results of the other two libraries were underestimated for scattering at the continuum energy level.

关 键 词：Iron sphere CENDL-3.2 Shielding benchmark experiment Pulsed 14 MeV neutron source Time-of-flight method 

分 类 号：O571.5[理学—粒子物理与原子核物理]