Regular Article - Experimental Physics
Cross-sections and isomeric ratios for the 136Xe(n,2n)135m,gXe reactions in the 14 MeV region with covariance analysis
Institute of New Energy, Hexi University, 734000, Zhangye, China
2 School of Physics and Electromechanical Engineering, Hexi University, 734000, Zhangye, China
3 National Institute of Metrology, 100029, Beijing, China
4 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621900, Mianyang, China
5 National Institute for Radiological Protection, China CDC, 100088, Beijing, China
Accepted: 18 July 2022
Published online: 2 August 2022
The neutron activation cross-section and ratios of the isomeric cross-section (σm/σg) in 136Xe(n,2n)135m,gXe reactions were measured according to the 93Nb(n,2n)92mNb reference reaction cross-section within the range for neutron spectrum energy 13–15 MeV. High purity and high-pressure natural xenon gas was used as the target sample. Neutrons were generated through the reaction of T(d,n)4He. A lead-shielded HPGe detector was used to measure the γ–ray spectra of the residue product. In the experiment, the true coincidence summing effect, sample counting geometry, the solid angle of the neutron flux, and self-attenuation of the characteristics γ-ray were corrected. A detailed covariance analysis has been performed by using the uncertainty propagation, while the measured cross-sections are being reported with their correlation matrix and uncertainties. Moreover, theoretical calculations were carried out on the TALYS-1.95 platform to obtain the reactions’ cross-sections of 136Xe(n,2n)135m,gXe compositions. Subsequently, the data from the measured cross-sections were compared to the theoretical values, the evaluation data, and the previous experimental results.
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