分类： 物理学 >> 核物理学 提交时间： 2025-01-27
Li, Dr. Xinxiang
Liu, Dr. Longxiang
Jiang, Dr. Wei
Chen, Miss YaJv
Ren, Dr. Jie
Wang, Prof. Hongwei
Fan, Prof. Gongtao
Luo, Dr. Wen
Feng, Dr. Song
XIe, Mr. Wen
Lin, Mr. ZiAn
Jiang, Miss Ting
Yang, Mr. GaoLe
An, Dr. ZhenDong
Li, Dr. Xankai
Liao, Mr. ZhouJi
Xue, Ms. Jieming
Li, Miss XinYu
Peng, Miss NingXin
Wang, Mr. Dexin
摘要： \ce{^{147,149}Sm} are slow neutron capture (s-process) nuclides in nuclear astrophysics, whose ($n,\gamma$) cross-section are the important input parameters in nucleosynthesis net calculation in the Samarium (Sm) region. Additionally, \ce{^{149}Sm} is a fission product of \ce{^{235}U} with 1\% yield, and its neutron resonance parameters play a critical role in reactor neutronics. According to the available nuclear evaluation databases, significant disagreement have been observed in the resonance peaks of \ce{^{147,149}Sm} (n,$\gamma$) cross section data within the energy range of 20-300 eV. In this study, the neutron capture cross section of the natural Samarium target was measured at the back-streaming white neutron beamline of China Spallation Neutron Source. The neutron capture yield was obtained and the neutron resonance parameters for \ce{^{147}Sm} at 107.0， 139.4， 241.7， and 257.3 eV and \ce{^{149}Sm} at 23.2, 24.6, 26.1, 28.0, 51.5, 75.2, 90.9, 125.3, and 248.4 eV were extracted using the SAMMY code based on R-matrix theory. For the parameters $\Gamma_n$ and $\Gamma_\gamma$ in these energies of \ce{^{147,149}Sm}, the percentages consistent with the results of the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, JENDL-4.0, and BROND-3.1 database are 27\%, 65\%, 65\%, 42\%, and 58\%, respectively. Meanwhile, 27\% of the results were inconsistent with them included in any of the major libraries. This work enrichis the experimental data of \ce{^{147,149}Sm} neutron capture resonance and helps to clarify the differences between different evaluation databases at the above energies.
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