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银是考古领域十分常见的材料，其中子全截面在基于中子共振透射分析（Neutron Resonance Transmission Analysis，NRTA）的科技考古场景中具有重要应用。本工作基于中国散裂中子源（China Spallation Neutron Source，CSNS）反角白光中子实验装置（Back-n），利用基于235U的快裂变电离室，测量了天然银样品在10-100 eV范围内共振能区的中子全截面数据，并结合R矩阵理论对天然银样品的中子透射率进行了拟合，得到了相应的共振参数。本工作为CSNS Backn上开展的NRTA方法学研究提供了新的数据支撑，同时丰富了天然银的中子全截面实验测量数据。本文数据集可在https://www.scidb.cn/s/mu2Mjq中访问获取。Silver is a very common material in archaeology, and its neutron total cross-section is crucial for Neutron Resonance Transmission Analysis (NRTA) in archaeometry. In this work, the neutron total cross sections of natural silver (natAg) in the resonance region from 10 to 100 eV were measured at the China Spallation Neutron Source (CSNS) back-streaming neutron facility (Back-n). The neutron transmission rate of a 0.3 mm natAg sample was measured with a fission chamber equipped with 235U neutron converters. The neutron total cross-sections around resonance peaks at 16.25 eV, 30.35 eV, 40.15 eV, 41.35 eV, 44.6 eV, 51.25 eV, 55.45 eV, 70.75 eV, 87.3 eV were obtained. The cross-sections measured in this work are generally higher than previous measurements by G. Kim et al. and F. G. P. Seidl et al. These significant discrepancies are probably due to the resolution function of the facility, which is very sensitive to the resonance peaks.
The resonance parameters—the peak position of the resonances (Eres) and the neutron width (Γn)—of 107Ag and 109Ag were extracted by fitting the transmission rate based on R-matrix theory. The extracted parameters Eres and Γn are generally in good agreement with ENDF/B-VIII.0 and CENDL-3.2 evaluations, except that the neutron width at 16.33 eV is significantly lower than that in the evaluations. The resolution function of the facility is considered to be the main reason of the inaccuracy. More accurate resonance parameters could be extracted in the future when a better control of the resolution function is achieved.
This work provides new cross-section data that supports the research and development of NRTA technique at CSNS Back-n facility and contributes to the experimental dataset for the neutron total cross-section of natural silver. The dataset of this paper is available at https://www.scidb.cn/s/mu2Mjq.-
Keywords:
- neutron total cross section /
- natural silver /
- China spallation neutron source /
- Back-n facility
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