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Measurement of Continuous Energy Neutron Incident Neutron Production Double Differential Cross Sections

连续能量中子入射中子产生双微分截面的测量

基本信息

批准号：
15206110
负责人：
ISHIBASHI Kenji
金额：
$ 27.87万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Measurement of continuous-energy neutron-incident neutron-production double-differential cross sections were carried out for Al, Fe, In and Pb sample up to 400 MeV at the WNR facility of Los Alamos Neutron Science Center. It was difficult to adopt the time-of-flight method to obtain an emitted-neutron energy because it was unable to identify the time that an incident neutron was induced to a sample. The incident- and the emitted-neutron energy was obtained by the time-of-flight method and unfolding spectrum data of the deposited energy into a detector, respectively. The recoil proton method was adopted for higher-energy emitted-neutron detection above 100 MeV. The detector has phoswich configuration to separate full energy deposition events from partial energy deposition ones by pulse shape discrimination. This method needed much beam time because of low effective detection efficiency. Thick target neutron yields were measured to confirm availability of the recoil proton method on trial. Liquid organic scintillators were utilized for lower-energy emitted-neutron measurement below 100 MeV, Response functions of the detector were measured using low-intensity continuous-energy neutron at the WNR facility and compared with the results by the SCINFUL-QMD code. The emitted-neutron energy spectrum by the moving source model was assumed as desired neutron spectrum. Elastic scattering component was added to the moving source model because the detection system was unable to distinguish the elastic scattering events from all stored event data. The emitted-neutron spectra were obtained by unfolding the light output data from scintillators. It was found that the LA150 evaluated nuclear data library underestimated the backward experimental data for the incident energy above several tens MeV.

在美国洛斯阿拉莫斯中子科学中心的WNR装置上，对高达400 MeV的Al、Fe、In和Pb样品进行了连续能量中子入射中子产生双微分截面测量。由于无法识别入射中子诱导到样品的时间，因此难以采用飞行时间法获得发射中子的能量。通过飞行时间法获得入射中子能量和发射中子能量，并将沉积能量的光谱数据展开到探测器中。采用反冲质子法对100 MeV以上的高能发射中子进行探测。该探测器具有光开关结构，通过脉冲形状判别将全能量沉积事件与部分能量沉积事件区分开来。该方法由于有效检测效率低，需要耗费大量的波束时间。测量了厚靶中子产率，以证实反冲质子法在试验中的有效性。利用液体有机闪烁体测量100 MeV以下的低能发射中子，在WNR设施上使用低强度连续能中子测量探测器的响应函数，并与scifull - qmd代码的结果进行了比较。假定运动源模型发射的中子能谱为期望中子能谱。由于检测系统无法从所有存储的事件数据中区分出弹性散射事件，在运动源模型中加入了弹性散射分量。通过展开闪烁体的光输出数据，得到了发射中子能谱。发现LA150评价核数据库低估了几十MeV以上入射能量的后验实验数据。

项目成果

期刊论文数量（22）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Measurement of Continuous-Energy Neutron-Incident Neutron-Production Cross Section

连续能量中子入射中子产生截面的测量

DOI：
发表时间：
2005
期刊：
AIP Conference Proceedings 769
影响因子：
0
作者：
A.Saeki;T.Kozawa;Y.Yoshida;S.Tagawa;Oishi K;Nobuhiro Shigyo
通讯作者：
Nobuhiro Shigyo

(n, xn)Double-Differential Cross Section Measurement Using Continuous Energy Neutron Source

使用连续能量中子源的（n，xn）双微分截面测量

DOI：
发表时间：
2005
期刊：
Journal of Radiation Protection Bulletin Special Issue
影响因子：
0
作者：
R.B.Stephens;et. al.;Nobuhiro Shigyo
通讯作者：
Nobuhiro Shigyo

Measurement of Neutron-Production Double-Differential Cross Sections for Continuous-Energy-Neutron-Incidence on Fe and Pbby Liquid Organic Scintillator

连续能量中子入射 Fe 和 Pbby 液体有机闪烁体的中子产生双微分截面测量

DOI：
发表时间：
2005
期刊：
AIP Conference Proceedings 769
影响因子：
0
作者：
C.H.Pyeon;Y.Hirano;T.Misawa;H.Unesaki;S.Shiroya;D.Aoki et al.;Satoshi Kuieada
通讯作者：
Satoshi Kuieada

Attempt to Measure(n, xn)Double-Differential Cross Sections for Incident Neutron Energies above 100 MeV

尝试测量 100 MeV 以上入射中子能量的 (n, xn) 双微分截面