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Science China chemistry 2005年第2期48卷 101-106页

作者： zhao feng1.2,{1., suzhou university, suzhou 21.006, China 2. Key Laboratory of Colloid and Interface Science, Institute of chemistry, Chinese Academy of Sciences, Beijing 1.0080, China Correspondence should be addressed to tang ji’an (email: jatang@***) 1. chemistry and {1. engineering department Suzhou University 215006 Suzhou China 2. Key Laboratory of Colloid and Interface Science Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

Atomic force microscopy is employed to study the adsorption behavior of CTAB to mica surfaces. Results show that conformational transitions from globular micelles→cylindrical micelles→flat films are observed in the process of the adsorption of CTAB to mica at twice the bulk critical concentration. However, in 0.5 cmc CTAB solution, the adsorbed CTAB molecules to mica form the layered film structures, and apparent conformational transitions do not appear. Meanwhile, the phenomena of the adsorption of CTAB to mica and the dissociation of mica sur- faces are periodically observed.

关键词： atomic force microscopy (AFM), micelle, behavior of adsorption, the dissociation of mica surfaces.

利用非对称结构接枝单体调控聚丙烯熔融自由基支化反应

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高分子学报 2018年第5期28卷 588-597页

作者：季显丰邱健李明罡邢海平王军刘文彬唐涛高分子物理与化学国家重点实验室中国科学院长春应用化学研究所长春130022 哈尔滨工程大学材料科学与化学工程学院哈尔滨150001

研究了具有不同双键官能团反应活性的非等活性接枝单体对于聚丙烯(PP)熔融自由基反应的影响,探索了有效调控反应选择性的途径.首先合成了2种具有不同双键活性的非对称支化单体丙烯酸烯丁酯(BAC)、1.(烯丁氧甲基)-4-乙烯基苯(BMVB),采用... 详细信息

研究了具有不同双键官能团反应活性的非等活性接枝单体对于聚丙烯(PP)熔融自由基反应的影响,探索了有效调控反应选择性的途径.首先合成了2种具有不同双键活性的非对称支化单体丙烯酸烯丁酯(BAC)、1.(烯丁氧甲基)-4-乙烯基苯(BMVB),采用上述2种含有"非等活性双键"的多官能团化合物作为接枝单体制备长链支化聚丙烯(LCB-PP),探索降低LCB-PP制备过程中降解和交联副反应的途径,促进长链支化结构的形成.采用核磁、高温GPC(HT-GPC)及流变表征分析了改性样品的反应过程与支化结构.研究发现,将上述2种非对称接枝单体应用于过氧化物引发熔融接枝反应体系时,单体中高活性的双键能够把PP大分子自由基快速转变为较稳定的自由基,抑制PP的降解;而低活性的双键与PP大分子自由基反应产生支化结构,抑制交联反应.由于BMVB单体中高活性双键与低活性双键的竞聚率比值(1.000)比BAC(2800)高,其对于自由基熔融反应过程具有更好的调控效果,表现出PP降解不明显且长支链在分子链间分布均匀.

关键词：聚丙烯自由基反应熔体反应支化结构

Searching for^(76)Ge neutrinoless double beta decay with the CDEX-1. experiment

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Chinese Physics C 2024年第10期48卷 11-22页

作者： Bing-Tao Zhang Jun-Zheng Wang li-Tao {1. Qian Yue Ke-Jun Kang Yuan-jing li Hai-Peng An C.Greeshma jian-{1. Chang Yun-Huan Chen jian-{1. Cheng Wen-Han Dai Zhi Deng Chang-Hao Fang Xin-{1. Geng Hui Gong Qiu-Ju Guo Xu-Yuan Guo li He Sheng-Ming He jin-Wei Hu Han-Xiong Huang Tu-Chen Huang Hai-Tao jia Xi jiang S.Karmakar Hao-Bin li jian-Min li jin li Qian-Yun li Ren-Ming-jie li Xue-Qian li Yu-Lan li Yi-Fan liang Bin liao Fong-Kay lin Shin-Ted lin jia-Xuan liu Shu-Kui liu Yan-Dong liu Yu liu Yuan-Yuan liu Zhong-Zhi liu Hao Ma Yu-Cai Mao Qi-Yuan Nie jin-Hua Ning Hui Pan Ning-Chun Qi jie Ren Xi-Chao Ruan Ze She Manoj Kumar Singh Tian-Xi Sun Chang-jian tang Wei-You tang {1. Tian Guang-Fu Wang li Wang Qing Wang Yu-{41. Wang Yun-Xiang Wang Henry-Tsz-King Wong Shi-Yong Wu Yu-Cheng Wu Hao-{1. Xing Rui Xu Yin Xu Tao Xue Yu-Lu Yan Nan Yi Chun-Xu Yu Hai-Jun Yu jian-{41. Yue Ming Zeng Zhi Zeng {41.-Shou Zhang Lei Zhang Zhen-Hua Zhang Zhen-Yu Zhang Kang-Kang {1.} Ming-Gang {1.} ji-Fang Zhou Zu-Ying Zhou jing-Jun Zhou Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and {1. of {1. Physics Tsinghua UniversityBeijing 100084 department of Physics Tsinghua UniversityBeijing 100084 Institute of Physics Academia SinicaTaipei 11529 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875 College of Physics Sichuan UniversityChengdu 610065 School of Physics Peking UniversityBeijing 100871 department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413 Sino-French Institute of Nuclear and Technology Sun Yat-sen UniversityZhuhai 519082 School of Physics Nankai UniversityTianjin 300071 department of Physics Banaras Hindu UniversityVaranasi 221005 department of Physics Beijing Normal UniversityBeijing 100875

We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1.,1.008 kg)in the China jin{1. Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of^(76)Ge.A total of 504.3 kg⋅day effective exposure data was *** anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1.89–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was *** lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1.2)^(0ν)>1.0×1.^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<3.2–7.5 eV.

关键词： neutrinoless double beta decay CDEX point-contact germanium detector ^(76)Ge

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纳米铂颗粒的控制生长

Chinese Journal of chemical Physics 2005年第6期18卷 1019-1022页

作者：杜玉扣赵丰邹翠娥杨平李兴长唐季安苏州大学化学化工学院苏州215006 中国科学院化学研究所胶体与界面重点实验室北京100080

利用吸氢再还原法,进行逐步还原反应,合成了一系列大小的铂纳米颗粒;透射电镜和X光衍射分析表征的结果表明,铂颗粒是逐步长大的,经过32次生长,铂颗粒的平均粒径从1.8nm增加到1..1.m,平均增加步长约为0.4nm,且粒子均具较好的单分散性.

关键词：吸氢再还原法铂纳米颗粒 X射线衍射法

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Dan{1. Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen jinhui Chen ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Bo{1. Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui zhaoyuan Cui Brunella D'Anzi ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong jianin AGH university of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics {1. Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu {1. Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal {1. Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal university WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China ji{1.ang university HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China university of Geosciences Beijing China university of Geosciences WuhanHubei China university of Mining and Technology XuzhouJiangsu China West Normal university NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu {1. DalianLiaoning Dalian {1. of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP jiNR) Dubna East China university Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

盐碱地冬油菜压青还田对土壤理化性质及花生产量的影响

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中国油料作物学报 2024年第3期46卷 604-612页

作者：李庆凯迟宝杰王鹤翔万俊张昕悦刘苹唐朝辉郭峰赵自超万书波山东农业工程学院山东济南250100 养分资源高效利用全国重点实验室农业农村部黄淮海平原农业环境重点实验室山东省农业科学院农业资源与环境研究所山东济南250100 山东省作物遗传改良与生态生理重点实验室山东农业科学院山东济南250100

为改良盐碱地,实现花生的高产高效,探讨冬油菜压青还田对盐碱地花生土壤理化性质的影响。通过大田试验,连续3年在黄河三角洲盐碱地定点设置冬闲地不播种冬油菜、冬油菜蕾薹期压青还田和开花期压青还田3种处理,研究了不同时期冬油菜压青... 详细信息

为改良盐碱地,实现花生的高产高效,探讨冬油菜压青还田对盐碱地花生土壤理化性质的影响。通过大田试验,连续3年在黄河三角洲盐碱地定点设置冬闲地不播种冬油菜、冬油菜蕾薹期压青还田和开花期压青还田3种处理,研究了不同时期冬油菜压青还田对花生结荚期根部土壤容重、孔隙度、土壤团聚体粒径分布、水稳定性等结构特征和土壤pH、速效养分、有机质、盐分等化学性质的影响。结果表明,冬油菜压青还田有效改良了土壤结构特征,显著降低了0~20 cm和20~40 cm土层土壤容重;0~20 cm土层>2 mm、1.2 mm和0.5~1.mm粒级土壤团聚体数量显著增加,25 mm粒级土壤微团聚体数量则显著降低,土壤团聚体水稳定性显著提高。冬油菜压青还田显著增加了0~20 cm和20~40 cm土层有机质、碱解氮、有效磷和有效钾,平均比对照增加1..47%~l5.80%;显著降低了土壤含盐量,平均比对照降低20.76%,但各处理土壤pH差异不显著。从整体看,不同土层土壤理化性质以0~20 cm土层受到的影响较大,40~60 cm土层最小。蕾薹期和开花期冬油菜压青还田花生分别增产22.48%和29.41.,但两处理之间差异不显著。从相关性分析看,>2 mm土壤团聚体与有效养分呈显著正相关,与容重、盐分含量呈显著负相关;25 mm团聚体、容重与速效养分呈负相关。因此,冬油菜压青还田通过改良盐碱地土壤结构特征、增加土壤有效养分和降低土壤可溶性盐分等途径形成相对有利花生生长的土壤理化性状,从而增加了花生产量。

关键词：冬油菜绿肥花生盐碱地土壤理化性质产量

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基于白光中子源的^(1.7)Au中子辐射俘获截面测量及共振参数分析

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物理学报 2024年第7期73卷 104-113页

作者：罗淏天张奇玮栾广源王晓宇邹翀任杰阮锡超贺国珠鲍杰孙琪黄翰雄王朝辉吴鸿毅顾旻皓余滔解立坤陈永浩安琪白怀勇鲍煜曹平陈昊磊陈琪萍陈裕凯陈朕崔增琪樊瑞睿封常青高可庆韩长材韩子杰何泳成洪杨黄蔚玲黄锡汝季筱璐吉旭阳蒋伟江浩雨姜智杰敬罕涛康玲康明涛李波李超李嘉雯李论李强李晓李样刘荣刘树彬刘星言穆奇丽宁常军齐斌斌任智洲宋英鹏宋朝晖孙虹孙康孙晓阳孙志嘉谭志新唐洪庆唐靖宇唐新懿田斌斌王丽娇王鹏程王琦王涛峰文杰温中伟吴青彪吴晓光吴煊羊奕伟易晗于莉于永积张国辉张林浩张显鹏张玉亮张志永赵豫斌周路平周祖英朱丹阳朱科军朱鹏朱兴华中国原子能科学研究院核数据重点实验室北京102413 中国科学院高能物理研究所北京100049 散裂中子源科学中心东莞523803 核探测与核电子学国家重点实验室北京100049 中国科学技术大学近代物理系核探测与核电子学国家重点实验室合肥230026 北京大学物理学院核物理与核技术国家重点实验室北京100871 中国工程物理研究院核物理与化学研究所绵阳621900 西北核技术研究院西安710024 中国科学院大学北京100049 中国科学技术大学工程与应用物理系合肥230026 北京航空航天大学物理学院北京100083 华能山东石岛湾核电有限公司荣成264312

中子辐射俘获反应在反应堆运行、核装置设计及核天体物理研究中起重要的作用.4πBaF_(2)探测装置有着高时间分辨能力、低中子灵敏度、高探测效率等优点,适合开展中子辐射俘获反应截面数据的测量.中国原子能科学研究院核数据重点实验室... 详细信息

中子辐射俘获反应在反应堆运行、核装置设计及核天体物理研究中起重要的作用.4πBaF_(2)探测装置有着高时间分辨能力、低中子灵敏度、高探测效率等优点,适合开展中子辐射俘获反应截面数据的测量.中国原子能科学研究院核数据重点实验室建立了伽马全吸收装置(Gamma total absorption facility,GTAF),该装置用28块六棱BaF_(2)晶体和1.块五棱BaF_(2)晶体构成了外径25 cm,内径1. cm的球壳,覆盖了95.2%的立体角.利用GTAF在中国散裂中子源Back-n束线上,测量了1.7Au(n,γ)的反应截面数据.测量数据通过能量筛选、PSD方法、晶体多重性筛选进行了初步本底扣除,随后结合对^(nat)C及空样品的测量数据对本底进行了分析及扣除,获得了1.7Au俘获反应的产额,利用SAMMY程序拟合得到了^(1.7)Au在1.1.0 e V的共振能量、中子共振宽度和伽马共振宽度参数.实验测量结果与ENDF/B-VIII.0数据库符合良好,其共振参数存在一定差异,分析原因可能与GTAF能量分辨率、Back-n的中子能谱测量精度、以及实验本底扣除方法相关,这也是下一步工作的重点.

关键词：中子辐射俘获截面共振参数白光中子源伽马全吸收装置

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An Unusual compound based on 3,5-bis(4′-carboxyphenyl)-1.2,4-triazole and four types of barium complexes

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An Unusual compound based on 3,5-bis(4′-carboxyphenyl)-1,2,...

Measurement of the ^(232)Th(n,f)cross section in the 1.200 MeV range at the CSNS Back-n

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作者： Xiao Wang Xiao-li Chen Long {1. {1. Ju ji-jiang Wang feng Fu Xiang-yang Hou department of {1. and chemical engineering Shaanxi Key Laboratory of Chemical Reaction Engineering Yan′an University

The construction and making of high dimensional complexes containing of barium ions have greatly interested in their novel architectures and unique potential application as function materials science field,such as luminescence,gas storage and separation,etc[1.3].An unusual 3D complexes,namely,{[(Ba)(BCT)(HO)](HO)}(1.(HBCT=3,5-bis(4′-carboxyphenyl)-{1.,4-triazole)has been synthesized under

关键词：

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Nuclear Science and Techniques 2023年第8期34卷 142-153页

作者： Zhi-Zhou Ren Yi-Wei yang Yong-Hao Chen Rong liu Bang-jiao Ye jie Wen Hai-Rui Guo Zi-jie Han Qi-{1. Chen Zhong-Wei Wen Wei-li Sun Han Yi Xing-Yan liu Tao Ye jiang-Bo Bai Qi An jie Bao Yu Bao {1. Cao Hao-Lei Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-Qing feng Ke-Qing Gao Xiao-Long Gao Min-Hao Gu Chang-Cai Han Guo-Zhu He Yong-Cheng He yang Hong Yi-Wei Hu Han-Xiong Huang Xi-Ru Huang Hao-Yu jiang Wei jiang Zhi-jie jiang Han-Tao jing ling Kang Bo li Chao li jia-Wen li Qiang li Xiao li yang li jie liu Shu-Bin liu Ze Long Guang-Yuan Luan Chang-Jun Ning Meng-Chen Niu Bin-Bin Qi jie Ren Xi-Chao Ruan zhao-Hui Song Kang Sun Zhi-jia Sun Zhi-Xin Tan jing-Yu tang Xin-Yi tang Bin-Bin Tian li-jiao Wang Peng-Cheng Wang zhao-Hui Wang Xiao-Guang Wu Xuan Wu li-Kun Xie Xiao-Yun yang li Yu Tao Yu Yong-ji Yu Guo-Hui Zhang lin-Hao Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-liang Zhang Zhi-Yong Zhang Lu-{1. Zhou Zhi-Hao Zhou Ke-Jun Zhu department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and chemistry China Academy of Engineering PhysicsMianyang 621900China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of Applied Physics and Computational Mathematics Beijing 100088China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230027China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina Northwest Institute of Nuclear Technology Xi’an 710024China university of Chinese Academy of Sciences Beijing 100049China department of {1. and Applied Physics University of Science and Technology of ChinaHefei 230026China

The ^(232)Th(n,f)cross section is very important in basic nuclear physics and applications based on the Th/U fuel *** the time-of-flight method and a multi-cell fast-fission ionization chamber,a novel measurement of the^(232)Th(n,f)cross sec-tion relative to^(235)U in the 1.200 MeV range was performed at the China Spallation Neutron Source Back-n white neutron source(Back-n).The fission event-neutron energy spectra of^(232)Th and^(235)U fission cells were measured in the single-bunch *** 232Th/235U fission cross-sectional ratios were obtained,and the measurement uncertainties were 2.5–3.7%for energies in the 2–20 MeV range and 3.6–6.2%for energies in the 20–200 MeV ***^(232)Th(n,f)cross section was obtained by introducing the standard cross section of^(235)U(n,f).The results were compared with those of previous theoreti-cal calculations,measurements,and *** measured 232Th fission cross section agreed with the main evaluation results in terms of the experimental uncertainty,and 232Th fission resonances were observed in the 1.3 MeV *** present results provide^(232)Th(n,f)cross-sectional data for the evaluation and design of Th/U cycle nuclear systems.

关键词： 232Th(n f)cross section Fast-fission ionization chamber Back-n white neutron source

Measurements of differential and angle-integrated cross sections for the 1.B（n, α）7li reaction in the neutron energy range from 1.0 eV to 2.5 MeV

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Chinese Physics C 2019年第12期43卷 47-74页

作者： Haoyu jiang Wei jiang Huaiyong Bai Zengqi Cui Guohui Zhang Ruirui Fan HanYi Changjun Ning liang Zhou jingyu tang Qi An jie Bao Yu Bao {1. Cao Haolei Chen Qi{1. Chen Yonghao Chen Yukai Chen Zhen Chen Changqing feng Keqing Gao Minhao Gu Changcai Han Zijie Han Guozhu He Yongcheng He yang Hong Hanxiong Huang Weiling Huang Xiru Huang Xiaolu ji Xuyang ji Zhijie jiang Hantao jing ling Kang Mingtao Kang Bo li Chao li jiawen li Lun li Qiang li Xiao li yang li Rong liu Shubin liu Xingyan liu Guangyuan Luan Qili Mu Binbin Qi jie Ren Zhizhou Ren Xichao Ruan zhaohui Song Yingpeng Song Hong Sun Kang Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing tang Xinyi tang Binbin Tian lijiao Wang Pengcheng Wang Qi Wang Taofeng Wang zhaohui Wang jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu likun Xie Yiwei yang li Yu Tao Yu Yongji Yu linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yubin zhao Lu{1. Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China 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 department of Modem Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of Nuclear Physics and chemistry China Academy of Engineering PhysicsMianyang 621900China Northwest Institute of Nuclear Technology Xi'an 710024China university of Chinese Academy of Sciences Beijing 100049China department of {1. and Applied Physics University of Science and Technology of ChinaHefei 230026China School of Physics Beihang UniversityBeijing 100083China

Differential and angle-integrated cross sections for the 1.B(n,α)^7 li,1.B(n,α0)^7 li and 1.B(n,α1.^7 li^*reactions have been measured at CSNS Back-n white neutron *** enriched(90%)1.B samples 5.0 cm in diameter and^85.0μg/cm^2 in thickness each with an aluminum backing were prepared,and back-to-back mounted at the sample *** charged particles were detected using the silicon-detector array of the light-charged Particle Detector Array(LPDA)*** neutron energy En was determined by TOF(time-of-flight)method,and the valid a events were extracted from the En-Amplitude two-dimensional *** 1. silicon detectors,the differential cross sections of a-particles were measured from 1..2°to 1.0.8°.Fitted with the Legendre polynomial series,the(n,a)cross sections were obtained through *** absolute cross sections were normalized using the standard cross sections of the 1.B(n,α)^7 li reaction in the 0.3-0.5 MeV neutron energy *** measurement neutron energy range for the 1.B(n,α)^7 li reaction is 1.0 eV≤En2.5 Me V(67 energy points),and that for the 1.B(n,α0)^7 li and1.B(n,α1.^7 li^*reactions is 1.0 eV≤En1.0 MeV(59 energy points).The present results have been analyzed by the resonance reaction mechanism and the level structure of the 1.B compound system,and compared with existing measurements and evaluations.

关键词： 1.B(n,α)^7li reaction cross sections LPDA CSNS Back-n white neutron source