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KeV-region analysis of the neutron capture cross-section of 237Np
Journal of Nuclear Science and Technology ( IF 1.5 ) Pub Date : 2021-08-30 , DOI: 10.1080/00223131.2021.1954104
Gerard Rovira 1 , Tatsuya Katabuchi 1 , Kenichi Tosaka 1 , Shota Matsuura 1 , Yu Kodama 1 , H. Nakano 1 , Osamu Iwamoto 2 , Atsushi Kimura 2 , Shoji Nakamura 2 , Nobuyuki Iwamoto 2
Affiliation  

ABSTRACT

Neutron capture cross-section measurements for  237Np have been conducted with the Accurate Neutron Nucleus Reaction Measurement Instrument (ANNRI) at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC) using neutrons with energy ranging from thermal energy to 1 MeV. A time-of-flight (TOF) method using a NaI(Tl) detector was employed and the data were analyzed based on the pulse-height weighting technique in order to derive the neutron capture cross-section. The absolute capture cross-section was determined using the first resonance from JENDL-4.0 together with the total neutron flux derived from a  197Au sample measurement in which the first resonance was completely saturated. Both normalization techniques present agreement within 1%. The present results are also compared evaluated data libraries. There is a discrepancy of 10–25% discrepancy from 0.5 to 20 keV with JENDL-4.0. Nonetheless, above this energy JENDL-4.0 seems to reproduce the present data better as the results agree within uncertainties up to 500 keV. The cross-section results contain uncertainties below 4% from 0.5 to 30 keV. However, the total uncertainty increases to over 8% above 30 keV. Along with the cross-section measurement, theoretical calculations with the CCONE code were performed to reproduce the present results.



中文翻译:

237Np 中子俘获截面的 KeV 区域分析

摘要

中子捕获截面测量  237日本质子加速器研究中心 (J-PARC) 的材料和生命科学设施 (MLF) 使用精确中子核反应测量仪 (ANNRI) 进行 Np,使用能量范围从热能到 1 MeV 的中子。采用了使用 NaI(Tl) 检测器的飞行时间 (TOF) 方法,并基于脉冲高度加权技术分析数据,以推导出中子捕获截面。绝对俘获截面是使用来自 JENDL-4.0 的第一次共振以及来自 197Au 样品测量,其中第一次共振完全饱和。两种标准化技术都在 1%. 目前的结果也比较评估数据库。有 10-25 的差异%与 JENDL-4.0 的差异从 0.5 到 20 keV。尽管如此,在这个能量之上 JENDL-4.0 似乎可以更好地再现当前数据,因为结果在高达 500 keV 的不确定性内一致。横截面结果包含低于 4 的不确定性%从 0.5 到 30 keV。然而,总的不确定性增加到超过 8%高于 30 keV。除了横截面测量外,还使用 ​​CCONE 代码进行了理论计算以重现当前结果。

更新日期:2021-08-30
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