Preliminary spectrum shifter design for intermediate energy nuclear data benchmark experiments with DT neutrons
Preliminary spectrum shifter design for intermediate energy nuclear data benchmark experiments with DT neutrons
复制标题
DT中子中能核数据基准实验的初步谱移器设计
DOI：
10.1016/j.fusengdes.2008.11.054
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
C. Konno
中科院分区：
文献类型：
--
作者：
M. Ohta;K. Kondo;M. Matsunaka;H. Miyamaru;I. Murata;T. Iida;K. Ochiai;C. Konno
使用DT中子的整体基准实验并不总是足以在MeV区域进行核数据基准测试，低于10 MeV。放置在样品和DT中子源之间的中子谱移位器可以有效地使入射到样品中的DT中子达到中等程度。为了估算谱移位器的影响，用MCNP-4C计算了14 MeV中子在泄漏中子能谱和伽马射线能谱中的贡献比。计算是对具有Be、D2O或7LiD光谱移位器的Li2TiO3样品进行的。结果表明，Be移位器优于其他类型的Be移位器，对于降低14 MeV中子的贡献，特别是对次级伽马能谱测量是有效的。
Integral benchmark experiments with DT neutrons are not always sufficient for nuclear data benchmarking in the MeV region, below 10MeV. A neutron spectrum shifter, which will be placed between a sample and a DT neutron source, is effective to moderate DT neutrons incident to the sample. In order to estimate effects of the spectrum shifter, the ratio of the contribution of 14MeV neutrons in the leakage neutron and gamma-ray spectra was calculated with MCNP-4C for an experimental configuration at FNS of JAEA, Japan. The calculations were carried out for a Li2TiO3sample with a Be, D2O, or7LiD spectrum shifter. It was found out that the Be shifter was superior to others and the Be shifter was effective to decrease the contribution of 14MeV neutrons especially for secondary gamma-ray spectrum measurements.