Measurement of Br(n,γ)cross sections up to stellar s-process temperatures at the CSNS Back‑n

查看全文 作　　者：Gao‑Le [1]Yang;Zhen‑Dong [1,2,3,4]An;Wei [5,6]Jiang;Xian‑Kai [1,7]Li;Wei‑Wei [3,4,8]Qiu;Zheng‑Fa [3,4,8]Liao;Zi‑Yue [3,4,8]Zhuang;Xiao‑Ping [3,4]Zhang;Sheng‑Li [8]Chen;Chen‑Chen [8]Guo;Er‑Xi [8]Xiao;Xiao [8]Fang;Xin‑Xiang [2,7,9]Li;Xin‑Rong [2,9]Hu;Bing [2,9]Jiang;Jin‑Cheng [10]Wang;Jie [10]Ren;Wen [7]Luo;Zhi‑Chao [7]Zhu;Hao‑Yang [7]Lan;Zong‑Wei [7]Cao;Xu [10,11]Ma;Ying‑Du [11]Liu;Pu‑Sen [11]Wang;Yi [12]Yang;Ping [12]Su;Xian‑Gai [12]Deng;Wan‑Bing [12]He;Chun‑Wang [13,14]Ma;Yu‑Ting [13,14]Wang;Zhi‑Tao [15]Dai;Peng‑Qin [1]He;Ren‑Guang [1]Tang;Tao [1]Zhou;Jing [1]Wang;Han [5,6]Yi;Yue [5,6]Zhang;Yong‑Hao [5,6]Chen;Rui‑Rui [5,6]Fan;Ke‑Qing [5,6]Gao;Qiang [5,6]Li;Kang [5,6]Sun;Zhi‑Xin [5,6]Tan;Min‑Hao [5,6]Gu;Han‑Tao [5,6]Jing;Jing‑Yu [5,6,16]Tang

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China;[2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;[3]State Key Laboratory of Lunar and Planetary Sciences,Macao University of Science and Technology,Macao 999078,China;[4]CNSA Macao Center for Space Exploration and Science,Macao 999078,China;[5]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;[6]Spallation Neutron Source Science Center,Dongguan 523803,China;[7]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;[8]Sino‑French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;[9]University of Chinese Academy of Sciences,Beijing 100049,China;[10]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China;[11]School of Materials Science and Engineering,Xiangtan University,Xiangtan 411100,China;[12]Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE),Institute of Modern Physics,Department of Nuclear Science and Technology,Fudan University,Shanghai 200433,China;[13]Institute of Particle and Nuclear Physics,Henan Normal University,Xinxiang 453007,China;[14]School of Physics,Henan Normal University,Xinxiang 453007,China;[15]Shenzhen Center,Cancer hospital,Chinese Academy of Medical Sciences,Shenzhen 518100,China;[16]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230027,China

出　　处：《Nuclear Science and Techniques》索引2023年第34卷第11期,共16页

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.U1832182,11875328,11761161001,and U2032137);the Natural Science Foundation of Guangdong Province,China(Nos.18zxxt65 and 2022A1515011184);the Science and Technology Development Fund,Macao SAR(Grant No.008/2017/AFJ);the Macao Young Scholars Program of China(No.AM201907);the China Postdoctoral Science Foundation(Nos.2016LH0045 and 2017M621573);the Fundamental Research Funds for the Central Universities(Nos.22qntd3101 and 2021qntd28). 摘　　要：The neutron capture cross sections(n,γ)of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source.Promptγ-rays originating from neutron-induced capture events were detected using four C_(6)D_(6) detectors.The pulse-height weighting technique and double-bunch unfolding method based on Bayesian theory were used in the data analysis.Background deductions,normalization,and corrections were carefully considered to obtain reliable measurement results.The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region(RRR).The average cross sections in the unresolved resonance region(URR)were obtained from 10 to 400 keV.The experimental results were compared with data from several evaluated libraries and previous experi-ments in the RRR and URR.The TALYS code was used to describe the average cross sections in the URR.The astrophysical Maxwell average cross sections(MACSs)of ^(79,81)Br from kT=5 to 100 keV were calculated over a sufficiently wide range of neutron energies.At a thermal energy of kT=30 keV,the MACS value for ^(79)Br 682±68 mb was in good agreement with the KADoNiS v1.0 recommended value.By contrast,the value of 293±29 mb for ^(81)Br was substantially higher than that of the evaluated database and the KADoNiS v1.0 recommended value. 关键词：Time-of-flight technique Neutron capture cross sections Maxwell average cross sections

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Measurement of Br(n,γ)cross sections up to stellar s-process temperatures at the CSNS Back‑n

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