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Boron removal from metallurgical-grade silicon by CaO–SiO_2 slag refining

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Rare Metals 2015年第7期34卷 522-526页

作者： kui-Xian Wei Hai-Fei lu wen-Hui Ma yan-Long li zhao Ding Ji-jun wu Yong-Nian Dai The National Engineering Laboratory for Vacuum Metallurgy and State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province and Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities Kunming University of Science and Technology

Boron removal from metallurgical-grade silicon(MG-Si) using CaO–SiO2 slag was studied by employing a medium-frequency electromagnetic induction *** relationship between the optical basicity(K)of the CaO–SiO2 slag and the distribution coefficient of boron(LB) was ***, the local minimum and maximum LBvalues of 0.72 and 1.58 are obtained when K = 0.56 and K = 0.71, *** boron content in MG-Si decreases gradually with refinement time increasing, down to a minimum value of4.73 9 *** controlling step in the removal of boron from MG-Si is not the chemical reaction at the interface of the slag and ***, the controlling step is a diffusion mass transfer, in which boron impurities diffuse from molten silicon to the interface of the slag and silicon,or B2O3 formed by the chemical reaction diffuses from the slag–silicon interface to molten slag.

关键词： Metallurgical-grade silicon Boron removal Slag ref

High-quality reference genomes of swallowtail butterflies provide insights into their coloration evolution

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Zoological Research 2022年第3期43卷 367-379页

作者： Jin-wu he Ru Zhang jie yang Zhou Chang li-Xin Zhu Si-Han lu Fei-Ang Xie jun-Lai Mao Zhi-Wei Dong Gui-Chun liu Ping Hu yan Dong wen-Ting Wan Ruo-Ping zhao Tian-Zhu Xiong Jorge LLeón-Cortés Chu-yang Mao Wei Zhang Shuai Zhan jun li Lei Chen wen Wang Xue-yan li State Key Laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China School of Ecology and Environment Northwestern Polytechnical UniversityXi’anShaanxi 710072China Department of Biology and Food Engineering Chuzhou UniversityChuzhouAnhui 239000China School of Marine Science and Technology Zhejiang Ocean UniversityZhoushanZhejiang 316022China Department of Organismic and Evolutionary Biology Harvard UniversityCambridgeMA 02138USA Ecología para la Conservación de la Fauna Silvestre El Colegio de la Frontera Sur(ECOSUR)Carretera Panamericana y Periférico Sur s/n Barrio María AuxiliadoraSan Cristóbal de Las CasasChiapas CP 29290Mexico State Key Laboratory of Protein and Plant Gene Research Peking UniversityBeijing 100871China CAS Key Laboratory of Insect Developmental and Evolutionary Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 200032China Kunming College of life Science University of Chinese Academy of SciencesKunmingYunnan 650223China Center for Excellence in Animal Evolution and Genetics KunmingYunnan 650223China

Swallowtail butterflies(Papilionidae)are a historically significant butterfly group due to their colorful wing patterns,extensive morphological diversity,and phylogenetically important position as a sister group to all other butterflies and have been widely studied regarding ecological adaption,phylogeny,genetics,and ***,they contain a unique class of pigments,i.e.,papiliochromes,which contribute to their color diversity and various biological functions such as predator avoidance and mate *** date,however,the genomic and genetic basis of their color diversity and papiliochrome origin in a phylogenetic and evolutionary context remain largely ***,we obtained high-quality reference genomes of 11 swallowtail butterfly species covering all tribes of Papilioninae and Parnassiinae using long-read sequencing *** with previously published butterfly genomes,we obtained robust phylogenetic relationships among tribes,overcoming the challenges of incomplete lineage sorting(ILS)and gene *** genomic analyses indicated that the evolution of Papilionidae-specific conserved non-exonic elements(PSCNEs)and transcription factor binding sites(TFBSs)of patterning and transporter/cofactor genes,together with the rapid evolution of transporters/cofactors,likely promoted the origin and evolution of *** findings not only provide novel insights into the genomic basis of color diversity,especially papiliochrome origin in swallowtail butterflies,but also provide important data resources for exploring the evolution,ecology,and conservation of butterflies.

关键词： High-quality reference genome Swallowtail butterfly tribe Color evolution Papiliochromes

The influence of the Insight-HXMT/LE time response on timing analysis

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Research in Astronomy and Astrophysics 2021年第1期21卷 45-52页

作者： Deng-Ke Zhou Shi-jie Zheng li-Ming Song Yong Chen Cheng-kui li Xiao-Bo li Tian-Xiang Chen Wei-Wei Cui Wei Chen Da-Wei Han Wei Hu Jia Huo Rui-Can Ma Mao-Shun li Tian-Ming li Wei li he-Xin liu Bo lu Fang-jun lu Jin-lu Qu You-li Tuo Juan Wang Yu-Sa Wang Bai-yang wu Guang-Cheng Xiao Yu-Peng Xu yan-Ji yang Shu Zhang Zi-liang Zhang Xiao-Fan zhao Yu-Xuan 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 College of Physics Jilin UniversityChangchun 130012China

The LE is the low energy telescope that is carried on *** uses swept charge devices(SCDs)to detect soft X-ray ***’s time response is caused by the structure of the *** theoretical analysis and Monte Carlo simulations we discuss the influence of LE time response(LTR)on the timing analysis from three aspects:the power spectral density,the pulse profile and the time *** the LTR,the value of power spectral density monotonously decreases with the increasing *** power spectral density of a sinusoidal signal reduces by a half at frequency 536 *** corresponding frequency for quasi-periodic oscillation(QPO)signals is 458 *** root mean square(RMS)of QPOs holds a similar *** the LTR,the centroid frequency and full width at half maxima(FWHM)of QPOs signals do not *** LTR reduces the RMS of pulse profiles and shifts the pulse *** the time domain,the LTR only reduces the peak value of the cross-correlation function while it does not change the peak position;thus it will not affect the result of the time *** considering the time lag obtained from two instruments and one among them is LE,a 1.18 ms lag is expected caused by the *** time lag calculated in the frequency domain is the same as that in the time domain.

关键词： instrumentation:detectors methods:data analysis methods:analytical

XELOX(capecitabine plus oxaliplatin)plus bevacizumab(anti-VEGF-A antibody)with or without adoptive cell immunotherapy in the treatment of patients with previously untreated metastatic colorectal cancer:a multicenter,open-label,randomized,controlled,phase 3 trial

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2104-2113页

作者： Qiu-Zhong Pan Jing-Jing zhao liang liu Dong-Sheng Zhang li-Ping Wang wen-Wei Hu De-Sheng weng Xiang Xu Yi-Zhuo li yan Tang Wei-Hong Zhang jie-Yao li Xiao Zheng Qi-Jing Wang Yong-Qiang li Tong Xiang li Zhou Shuang-Ning yang Chen wu Rong-Xing Huang Jia he Wei-Jiao Du lu-jun Chen Yue-Na wu Bin Xu Qiong Shen Yi Zhang Jing-Ting Jiang Xiu-Bao Ren Jian-Chuan Xia State Key Laboratory of Oncology in South China Guangdong Provincial Clinical Research Center for CancerCollaborative Innovation Center for Cancer MedicineSun Yat-Sen University Cancer CenterGuangzhouGuangdong 510060PR China Department of Biotherapy Sun Yat-Sen University Cancer CenterGuangzhouGuangdong 510060PR China Tianjin Medical University Cancer Institute and Hospital National Clinical Research Center for CancerTianjin 300060PR China Key Laboratory of Cancer Immunology and Biotherapy Tianjin 300060PR China Department of Biotherapy/Immunology Tianjin Medical University Cancer Institute and HospitalTianjin 300060PR China Department of Medical Oncology Sun Yat-sen University Cancer CenterGuangzhou 510060PR China Department of Oncology the First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052PR China Department of Tumor Biological Treatment the Third Affiliated Hospital of Soochow UniversityChangzhouJiangsu 213003PR China Jiangsu Engineering Research Center for Tumor Immunotherapy ChangzhouJiangsu 213003PR China Institute for Cell Therapy of Soochow University ChangzhouJiangsu 213003PR China Department of Stem Cell&Regenerative Medicine State Key Laboratory of TraumaBurn and Combined InjuryDaping HospitalArmy Medical UniversityChongqing 400042PR China Imaging Diagnosis and Interventional Center Sun Yat-sen University Cancer CenterGuangzhouGuangdong 510060PR China

Fluoropyrimidine-based combination chemotherapy plus targeted therapy is the standard initial treatment for unresectable metastatic colorectal cancer(mCRC),but the prognosis remains *** phase 3 trial(***:NCT03950154)assessed the efficacy and adverse events(AEs)of the combination of PD-1 blockade-activated DC-CIK(PD1-T)cells with XELOX plus bevacizumab as a first-line therapy in patients with mCRC.A total of 202 participants were enrolled and randomly assigned in a 1:1 ratio to receive either first-line XELOX plus bevacizumab(the control group,n=102)or the same regimen plus autologous PD1-T cell immunotherapy(the immunotherapy group,n=100)every 21 days for up to 6 cycles,followed by maintenance treatment with capecitabine and *** main endpoint of the trial was progression-free survival(PFS).The median follow-up was 19.5 *** PFS was 14.8 months(95%CI,11.6-18.0)for the immunotherapy group compared with 9.9 months(8.0-11.8)for the control group(hazard ratio[HR],0.60[95%CI,0.40-0.88];p=0.009).Median overall survival(OS)was not reached for the immunotherapy group and 25.6 months(95%CI,18.3-32.8)for the control group(HR,0.57[95%CI,0.33-0.98];p=0.043).Grade 3 or higher AEs occurred in 20.0%of patients in the immunotherapy group and 23.5%in the control groups,with no toxicity-associated deaths *** addition of PD1-T cells to first-line XELOX plus bevacizumab demonstrates significant clinical improvement of PFS and OS with well tolerability in patients with previously untreated mCRC.

关键词： PD1 immunotherapy bevacizumab

Generating Proton Beams Exceeding 10 MeV Using High Contrast 60TW Laser

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Chinese Physics Letters 2018年第9期35卷 28-32页

作者： Yi-Xing Geng Qing-liao Yin-Ren Shou jun-Gao Zhu Xiao-Han Xu Min-Jian wu Peng-jie Wang Dong-Yu li Tong-yang Rong-Hao Hu Da-Hui Wang yan-Ying zhao wen jun Ma Hai-yang lu Zhong-Xi Yuan Chen-lin Xue-Qing yan State Key Laboratory of Nuclear Physics and Technology and CAPT Peking UniversityBeijing 100871 Collaborative hmovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006

A prototype of a laser driven proton accelerator is built at Peking University. Protons exceeding IOMeV are accelerated from micrometer-thick aluminum targets irradiated by tightly focused laser pulse with 1.8 J energy and 30fs duration. The beam energy spectrum and charge distribution are measured by a Thomson parabola spectrometer and radiochromic fihn stacks. The sensitivity of proton cut-off energy to the focusing of the laser beam, the pulse duration, and the foil thickness are systematically investigated in the experiments. Stable proton beams have been produced with an optimized parameter set, providing a cornerstone for the future applications of laser accelerated protons.

关键词： Generating Proton Beams Exceeding 10 MeV Using High Contrast 60TW Laser

Efficacy and safety of Shenyankangfu Tablet,a Chinese patent medicine,for primary glomerulonephritis:A multicenter randomized controlled trial

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Journal of Integrative Medicine 2021年第2期19卷 111-119页

作者： jie wu Shu-wei Duan Hong-tao yang Yue-yi Deng Wei li Ya-ni he zhao-hui Ni Yong-li Zhan Shan lin Zhi-yong Guo jun Zhu Jing-ai Fang Xu-sheng liu li-hua Wang Rong Wang Nian-song Wang Xiao-hong Cheng li-qun he Ping luo Shi-ren Sun Ji-feng Sun Ai-ping Yin Geng-ru Jiang Hong-yu Chen wen-hu liu Hong-li lin Meng liang lu Ma Ming Chen li-qun Song Jian Chen Qing Zhu Chang-ying Xing Yun li Ji-ning Gao Rong-shan li Ying li Hao Zhang Ying lu Qiao-ling Zhou jun-zhou Fu Qiang he Guang-yan Cai Xiang-mei Chen Department of Nephrology Chinese People’s Liberation Army General HospitalChinese People’s Liberation Army Institute of NephrologyState Key Laboratory of Kidney Diseases(2011DAV00088)National Clinical Research Center for Kidney DiseasesBeijing 100853China Department of Nephrology First Teaching Hospital of Tianjin University of Traditional Chinese MedicineTianjin 300192China Department of Nephrology Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China Department of Nephrology Shandong University of Traditional Chinese Medicine Affiliated HospitalJinan 250011.Shandong ProvinceChina Department of Nephrology Daping HospitalArmy Medical UniversityChongqing 400042China Department of Nephrology Renji HospitalShanghai Jiao Tong UniversityShanghai 200127China Department of Nephrology Guang’anmen HospitalChina Academy of Traditional Chinese Medical SciencesBeijing 100053China Department of Nephrology Tianjin Medical University General HospitalTianjin 300052China Department of Nephrology Changhai Hospital of ShanghaiNaval Medical UniversityShanghai 200433China Department of Nephrology West China HospitalChengdu 610083Sichuan ProvinceChina Department of Nephrology First Affiliated Hospital of Shanxi Medical UniversityTaiyuan 030001Shanxi ProvinceChina Department of Nephrology Guangdong Provincial Hospital of Chinese MedicineGuangzhou 510120Guangdong ProvinceChina Department of Nephrology Shanxi Medical University Second Affiliated HospitalTaiyuan 030001Shanxi ProvinceChina Department of Nephrology Shandong Provincial HospitalJinan 250021Shandong ProvinceChina Department of Nephrology and Rheumatology Affiliated Sixth People’s HospitalShanghai Jiao Tong UniversityShanghai 200233China Department of Nephrology Shaanxi Traditional Chinese Medicine HospitalXi'an 710003Shaanxi ProvinceChina Department of Nephrology Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 200021China Department of Nephrology Jilin University Se

Background:Shenyankangfu Tablet(SYKFT)is a Chinese patent medicine that has been used widely to decrease proteinuria and the progression of chronic kidney ***:This trial compared the efficacy and safety of SYKFT,for the control of proteinuria in primary glomerulonephritis patients,against the standard drug,losartan ***,setting,participants and intervention:This was a multicenter,double-blind,randomized,controlled clinical *** glomerulonephritis patients,aged 18-70 years,with blood pressure≤140/90 mmHg,estimated glomerular filtration rate(eGFR)>45 mL/min per 1.73 ㎡,and 24-hour proteinuria level of 0.5-3.0 g,were recruited in 41 hospitals across 19 provinces in China and were randomly divided into five groups:SYKFT,losartan potassium 50 mg or 100 mg,SYKFT plus losartan potassium 50 mg or 100 *** outcome measu res:The primary outcome was change in the 24-hour proteinuria level,after 48 weeks of ***:A total of 735 participants were *** percent decline of urine protein quantification in the SYKFT group after 48 weeks was 8.78%±2.56%(P=0.006)more than that in the losartan 50 mg group,which was 0.51%±2.54%(P=1.000)less than that in the losartan 100 mg *** with the losartan potassium 50 mg group,the SYKFT plus losartan potassium 50 mg group had a 13.39%±2.49%(Phe losartan potassium 100 mg group,the SYKFT plus losartan potassium 100 mg group had a 9.77%±2.52%(P=0.001)greater reduction in urine *** a superiority threshold of 15%,neither was statistically ***,serum creatinine and serum albumin from the baseline did not change statistically *** average change in TCM syndrome score between the patients who took SYKFT(-3.00[-6.00,-2.00])and who did not take SYKFT(-2.00[-5.00,0])was statistically significant(P=0.003).No obvious adverse reactions were observed in any ***:SYKFT decreased the proteinur

关键词： herbal medicine,Chinese Shenyankangfu Tablet Primary glomerulonephritis Randomized controlled trial Double blind Double dummy

Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： wen-Tao Zhang Xue-Qian Wang Feng-Qi Zhang Xiao-Ya Cui Bing-Bing Fan Jia-Ming Guo Zhi-Min Guo Rui Huang wen Huang Xu-Bo li Meng-Ru li yan Ma Zhi-Hua Shen Yong-Gang Sun De-Zhuang Wang Fei-yang Wang li-Qiang Wang Nan Wang Tian-li Wang Wei Wang Xiao-yang Wang Yi-Han Wang Fu-jie Yu Yu-Zhen Yin ling-Kun Zhang Yi Zhang Jian-yang Zhang Qi zhao Yu-Ping zhao Xin-Dong Zhu Yasir Sohail Ya-Nan Chen Tao Feng Qi-Long Gao Hai-yan he Yong-Jiang Huang Zeng-Bao Jiao Hua Ji Yao Jiang Qiang li Xiao-Ming li Wei-Bing liao Huai-jun lin Hui liu Qi liu Qing-Feng liu Wei-Di liu Xiong-jun liu yang lu Yi-Ping lu wen Ma Xue-Fei Miao jie Pan Qing Wang Hong-Hui wu Yuan wu Tao yang Wei-Ming yang Qian Yu Jin-Yu Zhang Zhi-Gang Chen liang Mao yang Ren Bao-Long Shen Xun-li Wang Zhe Jia he Zhu Zhen-Duo wu Si Lan School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Department of Physics City University of Hong KongHongKong 999077China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 100872China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China School of Physical Sciences Great Bay UniversityDongguan 523000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Beijing Advanced Innovation Center for Materials Genome Engineering Research Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Computing Macquarie UniversitySydney 2113Australia Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laborato

Owing to their exceptional properties,high-entropy alloys(heAs)and high-entropy materials have emerged as promising research areas and shown diverse ***,the recent advances in the field are comprehensively reviewed,organized into five *** first section introduces the background of heAs,covering their definition,significance,application prospects,basic properties,design principles,and *** subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory *** the following section,the emphasis shifts to functional materials,exploring heAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for ***,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption *** paper concludes with an outlook,discussing future directions and potential growth areas in the *** this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： High entropy alloys Cutting-edge structural materials Cutting-edgefunctional materials

Measurement of the ^(232)Th(n,f)cross section in the 1-200 MeV range at the CSNS Back-n

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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-Ping Chen Zhong-Wei wen Wei-li Sun Han Yi Xing-yan liu Tao Ye Jiang-Bo Bai Qi An jie Bao Yu Bao Ping 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-Ping 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 Engineering 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

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