Neutron capture reaction cross section measurement for iodine nucleus with detailed uncertainty quantification
Neutron capture reaction cross section measurement for iodine nucleus with detailed uncertainty quantification
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DOI：
10.1140/epjp/s13360-021-01824-y
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发表时间：
2021-08
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通讯作者：
A. Gandhi;Aman Sharma;Rebecca Pachuau;N. Singh;P. Patil;M. Mehta;L. Danu;S. Suryanarayana;B. K. Nayak;B. Lalremruata;A. Kumar
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作者：
A. Gandhi;Aman Sharma;Rebecca Pachuau;N. Singh;P. Patil;M. Mehta;L. Danu;S. Suryanarayana;B. K. Nayak;B. Lalremruata;A. Kumar
在中子能谱平均能量为0.602.51MeV的范围内，测量了I（n，）I反应的中子活化截面，并与In（n，inl）的参考监测反应截面进行了比较。 用Li（p，n）Be反应产生中子，用预先标定的铅屏蔽HPGe探测器离线测量了剩余产物的能谱。首次采用协方差分析方法定量分析了碘核中子能量截面测量的不确定度和不同能量截面之间的相关系数。测量中考虑了与射线自衰减过程、射线真符合求和效应和低本底中子能量贡献有关的必要修正。用标准核反应模型程序TMENS-1.9和EMPIRE-3.2进行了理论计算，得到了I（n，）I反应截面。将测量的截面与EXFOR数据库中的实验数据、理论预测结果以及ENDF/B-VIII.0、JEFF-3.1/A、TENDL-2019和JENDL-4.0评估的核数据进行了比较。
The neutron activation cross section forI(n,)I reaction has been experimentally measured with respect to theIn(n,inl)Inreference monitor reaction cross section in the neutron spectrum average energy range 0.602.51 MeV. The neutrons were produced throughLi(p,n)Be reaction, and-ray spectra of the residue product were measured offline with the precalibrated lead-shielded HPGe detector. The very first time the covariance analysis was done to quantify the measured cross section uncertainties and the correlation coefficients between the different neutron energy cross sections for iodine nucleus. The needful corrections related to the-ray self-attenuation process,-ray true coincidence summing effect and the low background neutron energy contributions were considered in the present measurement. Theoretical calculations were done using the standard nuclear reaction model codes TALYS-1.9 and EMPIRE-3.2 to obtain theI(n,)I reaction cross section. The measured cross sections were compared with the experimental data available in the EXFOR database, theoretical predicted results, and ENDF/B-VIII.0, JEFF-3.1/A, TENDL-2019, and JENDL-4.0 evaluated nuclear data.