在RPI LINAC中子俘获和透射测量的镉共振参数
Cadmium Resonance Parameters from Neutron Capture and Transmission Measurements at the RPI LINAC
摘要：
镉由于其高的热中子吸收截面，历来被用作积分实验的重要组分。对这些实验的正确解释依赖于精确的微分中子截面测量。在Gaerttner LINAC中心的60 MeV电子加速器被用来产生中子的中子捕获和总截面测量天然镉。在热和超热共振范围内进行测量，样品厚度范围为1 × 10-4至4 × 10-2原子/谷仓。为了确定镉同位素的热截面和共振积分，进行了全共振区分析。使用贝叶斯R矩阵代码SAMMY 8.0对数据进行形状拟合并提取共振参数。共振参数和截面的不确定性，从他们的主要组成部分：传输背景，捕获归一化，实验分辨率函数，突发宽度，样品厚度，和计数统计。使用多个样品厚度分析实验在测量的捕获和透射内的一致性。结果进行了比较，以前发表的测量和评估核库。没有重大的变化，热截面或第一谐振在Cd 113被确定从过去十年的测量和评估取得的共识。
英文摘要：
Cadmium has been used historically as an important component of integral experiments because of its high thermal neutron absorption cross section. Correct interpretation of such experiments depends on accurate differential neutron cross section measurements. The 60 MeV electron accelerator at the Gaerttner LINAC Center was used to generate neutrons for neutron capture and total cross section measurements of natural Cd. Measurements were performed in the thermal and epithermal resonance range with sample thicknesses ranging from 1 x 10-4 to 4 x 10-2 atoms per barn. A full resonance region analysis was performed in order to determine the thermal cross sections and resonance integrals of the cadmium isotopes. The Bayesian R-Matrix code SAMMY 8.0 was used to shape fit the data and extract the resonance parameters. Resonance parameter and cross section uncertainties were determined from their primary components: transmission background, capture normalization, experimental resolution function, burst width, sample thickness, and counting statistics. The experiments were analyzed for consistency within the measured capture and transmission using multiple sample thicknesses. Results are compared to previously published measurements and evaluated nuclear libraries. No major changes to the thermal cross section or the first resonance in Cd113 were identified from the consensus achieved from measurements and evaluations over the past decade.
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