检索结果-南通市图书馆

Journal of Integrative Plant Biology 2009年第1期51卷 29-34页

作者： cheng-he zhang xiao-feng li shu-xing shen he yuan shu-xin xuan College of Horticulture Agncultural University of Hebei Baoding 071001 China

A set of trisomics of Chinese cabbage was used for determining the n-I-1 gamete transmission rate and locating the gene controlling 2n gamete formation on the corresponding chromosome. The results showed that the transmission rates of extra chromosomes in different trisomics varied from 0% to 15.38% by male gametes and from 0% to 17.39% by female gametes. Of the nine F2 populations derived from the hybridizations between each trisomic and Bp058 （2n gamete material）, only Tri- 4xBp058 showed that the segregation ratio of plants without 2n gamete formation to plants with 2n gamete formation was 10.38：1, which fitted the expected segregation ratio of the trisomics （AAa） based on the 7.37% of n＋l gamete transmission through female and 5.88% through male. In other populations the segregation ratios varied from 2.48：1 to 3.72：1, which fitted the expected 3：1 segregation ratio of the bisomics （Aa）. These results suggested that the gene controlling 2n gamete formation in Chinese cabbage Bp058 was located on chromosome 4. Further trisomic analysis based on the chromosome segregation and the incomplete stochastic chromatid segregation indicated that the gene locus was tightly linked to the centromere.

关键词： Chinese cabbage gene location n+l gamete transmission primary trisomics 2n gametes.

Obtaining and Cytological Identification of a Set of Primary Trisomics in Cabbage

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Agricultural Sciences in China 2006年第9期5卷 655-660页

作者： zhang cheng-he ZHU Hai-yan li xiao-feng shen shu-xing CheN Xue-ping MAN Hong xuan shu-xin College of Horticulture Agricultural University of Hebei Baoding 071001 P.R.China

Selection of primary trisomics of the cabbage （Brassica oleracea *** L） forms an important basis for gene chromosome mapping and for other genetic studies. The cabbage self-fertilization line - 9601 was used as material, using the root-tip cell chromosome number and pollen mother cell chromosome number identification and karyotype analysis to select the primary trisomics from the progenies of 3x x 2x in the cabbage. Many aneuploid plants with one or two extra chromosomes were obtained and a set of primary trisomics （Tri-1, Tri-2, Tri-3, Tri-4, Tri-5, Tri-6, Tri-7, Tri-8, and Tri-9, in which the Tri-1 and Tri-4 were from 2n＋2 plants and others from 2n＋ 1 plants） was acquired from these plants. Each trisomic exhibited some unique features, such as plant height, plant type, leaf type, size of flower bud, and inflorescence. The triploid crossing by the diploid is a convenient and effective way to select trisomics in the cabbage.

关键词： cabbage (Brassica oleracea var.capitata L) trisomics karyotype analysis

大白菜雄性核不育基因的染色体定位及AFLP分子标记筛选

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中国农业科学 2009年第6期42卷 2061-2067页

作者：袁鹤张成合刘海河轩淑欣李晓峰申书兴河北农业大学园艺学院

【目的】基因定位是遗传研究的重点内容,也是育种工作的重要基础。本研究以大白菜雄性不育两用系‘大阳AB系’和大白菜系列初级三体为材料,对决定大白菜雄性不育性的核基因(ms)进行染色体定位和分子标记筛选,旨在为其分子克隆和遗传利... 详细信息

【目的】基因定位是遗传研究的重点内容,也是育种工作的重要基础。本研究以大白菜雄性不育两用系‘大阳AB系’和大白菜系列初级三体为材料,对决定大白菜雄性不育性的核基因(ms)进行染色体定位和分子标记筛选,旨在为其分子克隆和遗传利用奠定基础。【方法】基因的染色体定位采用初级三体遗传分析和χ2测验法,分子标记采用AFLP分析方法。【结果】大白菜‘大阳AB系’的雄性不育系(msms)×大白菜系列初级三体(Tri-1、Tri-2、Tri-3、Tri-4、Tri-5、Tri-6、Tri-7、Tri-8、Tri-9)的9个杂交组合中,F1均为可育株;从F1选出三体植株进行自交和测交,其自交子代(F2)和测交子代(Tc)中可育株与不育株的分离比例,只有Tri-4表现为15.5﹕1(F2)和3.24﹕1(Tc)、不符合孟德尔的单基因遗传分离比例(3﹕1和1﹕1),其它三体在2.60﹕1～3.76﹕1(F2)和0.81﹕1～1.48﹕1(Tc)、均符合孟德尔的单基因遗传分离比例(3﹕1和1﹕1),这表明该雄性不育性的遗传与Tri-4的遗传表现一致,即确定该雄性不育性的基因位于大白菜4号染色体上。基于染色体和染色单体分离的三体遗传分析表明,该雄性不育基因位于4号染色体的近着丝点区域,通过对124个AFLP引物组合的筛选,初步获得了一个与雄性核不育基因位点连锁的AFLP标记E34M49(398bp),遗传距离约为1.2cM。【结论】利用初级三体遗传分析首次将大白菜雄性核不育基因定位在第4号染色体上。

关键词：大白菜初级三体雄性不育基因定位 AFLP标记

Measurement of the neutron total cross section of carbon at the Back-n white neutron beam of CSNS

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Nuclear Science and Techniques 2019年第9期30卷 73-82页

作者： xing-Yan liu Yi-Wei Yang Rong liu Jie Wen Zhong-Wei Wen Zi-Jie Han Zhi-Zhou Ren Qi An Huai-Yong Bai Jie Bao Ping Cao Qi-Ping Chen Yong-Hao Chen Pin-Jing cheng Zeng-Qi Cui Rui-Rui Fan Chang-Qing feng Min-Hao Gu feng-Qin Guo Chang-Cai Han Guo-Zhu he Yong-cheng he Yue-feng he Han-Xiong Huang Wei-ling Huang Xi-Ru Huang xiao-Lu Ji Xu-Yang Ji Hao-Yu Jiang Wei Jiang Han-Tao Jing ling Kang Ming-Tao Kang Bo li Lun li Qiang li xiao li Yang li Yang li shu-Bin liu Guang-yuan Luan Ying-lin Ma Chang-Jun Ning Bin-Bin Qi Jie Ren Xi-Chao Ruan Zhao-Hui Song Hong Sun xiao-Yang Sun Zhi-Jia Sun Zhi-xin Tan Hong-Qing Tang Jing-Yu Tang Peng-cheng Wang Qi Wang Tao-feng Wang Yan-feng Wang Zhao-Hui Wang Zheng Wang Qing-Biao Wu xiao-Guang Wu xuan Wu li-Kun Xie Han Yi li Yu Tao Yu Yong-Ji Yu Guo-Hui zhang Jing zhang lin-Hao zhang li-Ying zhang Qing-Min zhang Qi-Wei zhang Xian-Peng zhang Yu-liang zhang Zhi-Yong zhang Ying-Tan Zhao liang Zhou Zu-Ying Zhou Dan-Yang Zhu Ke-Jun Zhu Peng Zhu Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics State Key Laboratory of Particle Detection and Electronics Chinese Academy of Sciences(CAS) Department of Modern Physics University of Science and Technology of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking University Key Laboratory of Nuclear Data China Institute of Atomic Energy Institute of High Energy Physics Chinese Academy of Sciences(CAS) Spallation Neutron Source Science Center University of South China Northwest Institute of Nuclear Technology Department of Engineering and Applied Physics University of Science and Technology of China Beihang University Xi’an Jiaotong University

To verify the performance of the neutron total cross-sectional spectrometer, the neutron total cross section of carbon is initially measured in the energy range of 1 eV to 20 MeV using the time-of-flight method. The measurement is performed at the Back-n white neutron source with a 76-m time-of-flight path using the China Spallation Neutron Source. A multilayer fast fission chamber with 235U and 238U is employed as the neutron detector. The diameter and thickness of the natural graphite sample are 70 mm and 40 mm, respectively. Signal waveforms are collected using a data acquisition system. Off-line data processing was used to obtain the neutron time-of-flight spectra and transmissions. The uncertainty of the counting statistics is generally approximately 3% for each bin in the energy range of 1–20 MeV. It is determined that the results for the neutron total cross section of carbon obtained using ^235U cells are in good agreement with the results obtained using 238U cells within limits of statistical uncertainty. Moreover, the measured total cross sections show good agreement with the broadening evaluated data.

关键词： CSNS Back-n white neutron source NTOX Neutron total cross section Carbon Multilayer fast fission chamber

Timing analysis of the black hole candidate EXO 1846–031 with Insight-HXMT monitoring

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Research in Astronomy and Astrophysics 2021年第3期21卷 193-204页

作者： he-xin liu Yue Huang Guang-cheng xiao Qing-Cui Bu Jin-Lu Qu shu zhang shuang-Nan zhang shu-Mei Jia Fang-Jun Lu Xiang Ma lian Tao Wei zhang li Chen li-Ming Song Ti-Pei li Yu-Peng Xu Xue-Lei Cao Yong Chen Cong-Zhan liu Ce Cai Zhi Chang Gang Chen Tian-Xiang Chen Yi-Bao Chen Yu-Peng Chen Wei Cui Wei-Wei Cui Jing-Kang Deng Yong-Wei Dong yuan-yuan Du Min-Xue Fu Guan-Hua Gao he Gao Min Gao Ming-Yu Ge Yu-Dong Gu Ju Guan cheng-cheng Guo Da-Wei Han Jia Huo Lu-Hua Jiang Wei-Chun Jiang Jing Jin Yong-Jie Jin ling-Da Kong Bing li cheng-Kui li Gang li Mao-shun li Wei li Xian li xiao-Bo li Xu-Fang li Yang-Guo li Zheng-Wei li xiao-Hua liang Jing-yuan liao Bai-sheng liu Guo-Qing liu Hong-Wei liu xiao-Jing liu Yi-Nong liu Bo Lu Xue-feng Lu Qi Luo Tao Luo Bin Meng Yi Nang Jian-Yin Nie Ge Ou Na Sai Ren-cheng Shang xin-Ying Song liang Sun Ying Tan You-li Tuo Chen Wang Guo-feng Wang Juan Wang ling-Jun Wang Weng-shuai Wang Yu-Sa Wang Xiang-Yang Wen Bai-Yang Wu Bo-Bing Wu Mei Wu shuo xiao Shao-lin Xiong he Xu Jia-Wei Yang sheng Yang Yan-Ji Yang Yi-Jung Yang Qi-Bin Yi Qian-Qing Yin yuan You Ai-Mei zhang cheng-Mo zhang Fan zhang Hong-Mei zhang Juan zhang Tong zhang Wan-Chang zhang Wen-Zhao zhang Yi zhang Yi-Fei zhang Yong-Jie zhang yuan-Hang zhang Yue zhang Zhao zhang Zhi zhang Zi-liang zhang Hai-sheng Zhao xiao-Fan Zhao Shi-Jie Zheng Yao-Guang Zheng Deng-Ke Zhou Jian-feng Zhou Yu-xuan Zhu Ren-lin Zhuang Yue Zhu Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Institut fur Astronomie und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard Karls Universität72076 TubingenGermany Department of Astronomy Beijing Normal UniversityBeijing 100088China Department of Astronomy Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China College of Physics Sciences&Technology Hebei UniversityBaoding 071002Hebei ProvinceChina

We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846-031 during its outburst in 2019 with the observations of Insight-HXMT,NICER and *** outburst can be classified roughly into four different ***-C quasi-periodic oscillations(QPOs)observed by NICER(about 0.1-6 Hz)and Insight-HXMT(about 0.7-8 Hz)are also reported in this ***,we study various physical quantities related to QPO *** QPO rms-frequency relationship in the energy band 1-10 keV indicates that there is a turning pointing in frequency around2 Hz,which is similar to that of GRS 1915+105.A possible hypothesis for the relationship above may be related to the inclination of the source,which may require a high inclination to explain *** relationships between QPO frequency and QPO rms,hardness,total fractional rms and count rate have also been found in other transient sources,which can indicate that the origin of type-C QPOs is non-thermal.

关键词： X-ray binaries black hole candidate QPO EXO 1846–031

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang li li‑Jiao Wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu Tao li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing feng Rong zhang xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu he Yong‑cheng he Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin ling Kang Bo li Gong li xiao li Yang li Jie liu Rong liu shu‑Bin liu Yi‑Na liu Guang‑yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑xin Tan sheng‑Da Tang Jin‑cheng Wang Peng‑cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen xiao‑Guang Wu xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui zhang Hang‑Chang zhang lin‑Hao zhang Qi‑Wei zhang Xian‑Peng zhang Yu‑liang zhang Yue zhang Zhi‑Yong zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

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二倍体和四倍体结球甘蓝减数分裂观察

河北农业大学学报 2008年第2期31卷 21-26页

作者：轩淑欣张成合申书兴陈雪平李晓峰河北农业大学园艺学院河北保定071001

观察了二倍体和同源四倍体结球甘蓝花粉母细胞减数分裂过程。结果表明:与二倍体相比,同源四倍体终变期染色体构型复杂,有四价体、三价体、二价体和单价体出现;中期Ⅰ及中期Ⅱ有个别染色体游离于赤道板外;后期Ⅰ出现落后染色体、提前解... 详细信息

观察了二倍体和同源四倍体结球甘蓝花粉母细胞减数分裂过程。结果表明:与二倍体相比,同源四倍体终变期染色体构型复杂,有四价体、三价体、二价体和单价体出现;中期Ⅰ及中期Ⅱ有个别染色体游离于赤道板外;后期Ⅰ出现落后染色体、提前解离的姊妹染色单体及染色体的不均衡分离;后期Ⅱ每极染色体数目变化较大;花粉的整齐度和生活力明显降低;讨论了造成四倍体结球甘蓝花粉育性比二倍体低的细胞学原因。

关键词：结球甘蓝二倍体同源四倍体花粉孢母细胞减数分裂花粉生活力

A randomized, multicenter controlled trial to compare the efficacy of recombinant human parathyroid hormone （1-34） with elcatonin in postmenopausal women with osteoporosis in China

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Chinese Medical Journal 2009年第24期122卷 2933-2938页

作者： zhang Xiu-zhen WANG Bo YANG Jun xuan Miao SONG li-ge li Hong GUO xiao-hui LU xiao-feng XUE Qing-yun YANG Gang-yi JI Qiu-he shen Jie liU Zhi-min li cheng-jiang WU Tian-feng TONG xiao-cui JIA yuan Department of Endocrinology Tongji Hospital of Tongji University Shanghai 200065 China Department of Endocrinology Peking University First Hospital Beijing 100034 China Department of Endocrinology General Hospital of the Chinese People's Liberation Army Beijing Military Region Beijing 100700 China Department of Endocrinology Beijing Hospital Beijing 100730 China Department of Endocrinology Second Affiliated Hospital of Chongqing Medical University Chongqing 400010 China Department of Endocrinology Xijing Hospital of Fourth Military Medical University Xi'an Shaanxi 710032 China Department of Endocrinology Nanfang Hospital of Nanfang Medical University Guangzhou Guangdong 510515 China Department of Endocrinology Changzheng Hospital Second Military Medical University Shanghai 200003 China Department of Endocrinology First Affiliated Hospital of Zhejiang University Hangzhou Zhejiang 310003 China Department of Endocrinology Zhejiang Hospital Hangzhou Zhejiang 310013 China

Background Recombinant human parathyroid hormone （1-34）（rhPTH （1-34）） given by injection is a new seventh class drug of biological products, which is prepared by adopting gene recombination technique, rhPTH （1-34） is mainly used to treat osteoporosis, especially for postmenopausal women. This study compared the clinical efficacy and safety of rhPTH （1-34） with elcatonin for treating postmenopausal women with osteoporosis in 11 urban areas of China. Methods Two hundred and five women with osteoporosis were enrolled in a 6-month, multicenter, randomized, controlled study. They were randomized to receive either rhPTH （1-34） 20 ug （200 U） daily or elcatonin 20 U weekly. Lumbar spine （L1-4） and femoral neck bone mineral density （BMD）, as well as biochemical markers of bone turnover were measured. Adverse events were recorded. Results rhPTH （1-34） increased lumbar BMD significantly more than did elcatonin at 3 months and 6 months （2.38% vs 0.59%, P 〈0.05; 5.51% vs 1.55%, P 〈0.01）, but there were no significant increases of BMD in these two groups at femoral neck. There were larger mean increases in bone markers in the rhPTH （1-34） group than in the elcatonin group at 3 months and 6 months （serum bone-specific alkaline phosphatase （BSAP） 36.79% vs 0.31%; 92.42% vs -0.17%; urinary N-telopeptide/creatinine （NTX/Cr） 48.91% vs -5.32%; 68.82% vs -10.86%）. Both treatments were well tolerated and there were no significant differences detected between the two groups in the proportion of any adverse events and any serious adverse events （67.0% vs 59.0%; 0 vs 0）. Conclusions rhPTH （1-34） has more positive effects on bone formation, as shown by the larger increments of lumbar BMD and bone formation markers, than elcatonin, with only mild adverse events and no significant change in the liver, kidney or hematological indices.

关键词： recombinant human parathyroid hormone elcatonin osteoporosis bone mineral density

菜薹-芥蓝单体异附加系n+1配子传递及两个二体异附加系的获得

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中国农业科学 2010年第23期43卷 4871-4876页

作者：陈雪平申二巧张成合李晓峰轩淑欣申书兴河北农业大学园艺学院

【目的】研究菜薹-芥蓝单体异附加系n+1配子传递,为其在基因定位和遗传改良上的应用奠定基础。【方法】通过观察和统计各单体异附加系减数分裂后期Ⅱ10/10/11/11分离的PMCs,估算n+1配子的形成频率;通过鉴定回交子代植株的染色体数目,测... 详细信息

【目的】研究菜薹-芥蓝单体异附加系n+1配子传递,为其在基因定位和遗传改良上的应用奠定基础。【方法】通过观察和统计各单体异附加系减数分裂后期Ⅱ10/10/11/11分离的PMCs,估算n+1配子的形成频率;通过鉴定回交子代植株的染色体数目,测定各单体异附加系n+1配子的传递率;从单体异附加系的自交子代中筛选二体异附加系。【结果】依据减数分裂后期Ⅱ10/10/11/11分离的PMCs比率估算,各单体异附加系n+1雄配子的形成频率在36.85%—45.15%;基于染色体数目鉴定,各单体异附加系n+1雄配子的传递率在7.14%—14.81%,雌配子在19.70%—36.51%;在一定范围内,n+1配子传递率与n+1配子形成频率、染色体大小、花粉量和花粉生活力没有显著的相关性;从自交子代中获得了两个不同的二体异附加系。【结论】菜薹-芥蓝各单体异附加系的额外染色体通过雌、雄配子均能进行传递,但传递率因不同的附加系而异;从单体异附加系的自交子代中可以分离出遗传性稳定的二体异附加系。

关键词：菜薹芥蓝附加系 n+1配子形成和传递

In-beam gamma rays of CSNS Back-n characterized by black resonance filter

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Nuclear Science and Techniques 2024年第10期35卷 149-160页

作者： Jin-cheng Wang Jie Ren Wei Jiang Xi-Chao Ruan Ying-Yi liu Hao-Lan Yang Kuo-Zhi Xu xin-Yi Pan Qi Sun Jie Bao Han-Xiong Huang Hao-Fan Bai Jiang-Bo Bai Ping Cao Qi-Ping Chen Yong-Hao Chen Wen-Hao Duan An-Chuan Fan Rui-Rui Fan Chang-Qing feng Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu he Yong-cheng he Yang Hong Yi-Wei Hu Zhi-Jie Jiang ling Kang Chang-lin Lan Bo li feng li Qiang li xiao li Yang li Jie liu Rong liu shu-Bin liu Yi-Na liu Guang-yuan Luan Chang-Jun Ning Yi-Jia Qiu Wen-Kai Ren Zhi-Zhou Ren Zhao-Hui Song Kang Sun Zhi-xin Tan Jing-Yu Tang sheng-Da Tang li-Jiao Wang Peng-cheng Wang Zhao-Hui Wang Zhong-Wei Wen xiao-Guang Wu xuan Wu Ze-Peng Wu Cong Xia li-Kun Xie Han Yi Tao Yu Yong-Ji Yu Guo-Hui zhang Hang-Chang zhang Qi-Wei zhang Xian-Peng zhang Yu-liang zhang Zhi-Yong zhang Mao-yuan Zhao Zhi-Hao Zhou Ke-Jun Zhu Chong Zou Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Advanced Technology University of Science and Technology of ChinaHefei 230027China

The back-streaming white-neutron beamline(Back-n)of the China Spallation Neutron Source is an essential neutronresearch platform built for the study of nuclear data,neutron physics,and neutron *** types of cross-sectional neutron-reaction measurements have been performed at Back-n since early *** measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron *** gamma rays,commonly referred to as in-beam gamma rays,can induce a non-negligible experimental background in neutron-reaction *** the characteristics of in-beam gamma rays is important for understanding the experimental ***,measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons;thus,discriminating between neutron-induced signals and those from in-beam gamma rays is *** this study,we propose the use of the black resonance filter method and a CeBr_(3) scintillation detector to measure the characteristics of the in-beam gamma rays of *** types of black resonance filters,^(181)Ta,^(59)Co,^(nat)Ag,and^(nat)Cd,were used in this *** time-of-flight(TOF)technique was used to select the detector signals remaining in the absorption region of the TOF spectra,which were mainly induced by in-beam gamma *** energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the CeBr_(3) scintillation detector and using Monte Carlo *** on the results of this study,the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated,which is beneficial for enhancing both the experimental methodology and data analysis.

关键词： In-beam gamma rays Back-n CeBr_(3)scintillator Black filter resonance technique