Experimental determination of the neutron resonance peak of Er 162 at 67.8 eV

作者：Xinxiang Li, L. X. Liu, Weijie Jiang, Jie Ren, H. W. Wang, Gong-Tao Fan, Dexin Wang, S. Y Zhang, Guo Liang Yang, Xinchuan Li, Zhen-Dong An, J. J. He, Wen Luo, X. G. Cao, Liying Song, Yue Zhang, X. Hu, Zi-Rui Hao, P. Kuang, Bing Jiang, X. H. Wang, Jifeng Hu, Y. D. Liu, Christman J.W., Y. T. Wang, Jun Su, L. Y. Zhang, Y.X. Yang, Song Feng, W. B. Liu, Weibo Su, Shuyuan Jin, Kai-Jie Chen · 发表于：Physical Review C · 年份：2022 · DOI：10.1103/physrevc.106.065804 · 被引用次数：14 · 研究领域：Nuclear Physics and Applications、Nuclear reactor physics and engineering、Nuclear physics research studies

$^{162}\mathrm{Er}$ is one of the $p$ nuclei in nuclear astrophysics, and its ($n,\ensuremath{\gamma}$) cross sections are important input parameters in nuclear astrophysics network calculations. Resonance data for $^{162}\mathrm{Er}(n,\ensuremath{\gamma})^{163}\mathrm{Er}$ at 67.8 eV is currently not present in the EXFOR database; however, it is included in the ENDF/B VIII.0 database. The ($n,\ensuremath{\gamma}$) cross section of $^{\mathrm{nat}}\mathrm{Er}$ has been measured in the energy range of 1--100 eV at the Back-n facility in the China Spallation Neutron Source. However, due to the influence of the in-beam $\ensuremath{\gamma}$ background of the Back-n Facility, it is has not been possible to observe the neutron resonance peak of $^{162}\mathrm{Er}$ at 67.8 eV. A general simulation method is proposed for quantifying the in-beam $\ensuremath{\gamma}$-ray background. By subtracting the in-beam $\ensuremath{\gamma}$-ray background, the neutron-capture yields of $^{162}\mathrm{Er}$ are obtained within the energy range of 20--100 eV. The neutron resonance parameters of $^{162}\mathrm{Er}$ at 67.8 eV are then extracted successfully. It is found that ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\gamma}}=101.15\ifmmode\pm\else\textpm\fi{}10.08$ meV and ${\mathrm{\ensuremath{\Gamma}}}_{n}=2.79\ifmmode\pm\else\textpm\fi{}0.28$ meV, which are consistent with the ENDF/B VIII.0 database. However, the 51.4-eV resonance peak of $^{162}\mathrm{Er}(n,\ensuremath{\gamma}$) is current...