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积分实验是检验评价中子核数据准确性的重要手段,利用标准样品法,对中国原子能科学研究院的积分实验系统进行了检验。标准样品分别采用聚乙烯(10 cm×10 cm×5 cm)和水(?10 cm×5 cm),通过中子飞行时间技术,获得了14 MeV氘氚脉冲中子与聚乙烯作用后47°方向泄漏中子谱,与水作用后30°方向泄漏中子谱。利用MCNP5程序获得相应的模拟,对模拟谱(C)与实验谱(E)中的中子与氢弹性散射峰(n-p散射峰)面积进行了比较。结果表明,两个样品的n-p散射峰面积C/E值均在2%内一致。实验证明系统获得的测量数据是可靠的。
The integral experiment is an important means to test the accuracy of the neutron data. The standard sample method is used to test the integral experimental system of China Institute of Atomic Energy. Standard samples were made of polyethylene (10 cm × 10 cm × 5 cm) and water (× 10 cm × 5 cm) respectively. The neutron flux of 14 MeV deuterium-tritium pulse and polyethylene were obtained by neutron time-of-flight technique. Leakage of neutron spectra in the direction of leakage of neutron spectra in the direction of 30 ° with water. Corresponding simulations were performed using the MCNP5 program to compare neutron-to-hydrogen elastic scattering peak (n-p scattering peak) areas in the simulated (C) and experimental (E) spectra. The results show that the n-p scattering peak area C / E values of both samples are within 2%. Experiments show that the measurement data obtained by the system is reliable.