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Al-Ca-Fe合金中Al_(10)CaFe_(2)化合物的形成与表征

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Transactions of Nonferrous Metals Society of China 2024年第2期34卷 361-377页

作者： N.A.BElOV T.K.AKOPYAN E.A.naumova V.V.DOROSHENKO T.A.SViRiDOVA N.O.KOROTKOVA National University of Science and Technology MiSiS 4 Leninsky pr.Moscow 119049Russia Baikov institute of Metallurgy and Materials Science 49 Leninsky pr.Moscow 119991Russia

采用热力学计算和实验技术研究铝角的Al-Ca-Fe体系相图,包括液相面投影图和凝固反应。结果表明,与铝固溶体(Al)平衡的不是Al_(3)Fe相,而是一种组成符合化学式Al_(10)CaFe_(2)的三元化合物。通过包晶转变l+Al_(3)Fe→(Al)+Al_(10)CaFe_(2... 详细信息

采用热力学计算和实验技术研究铝角的Al-Ca-Fe体系相图,包括液相面投影图和凝固反应。结果表明,与铝固溶体(Al)平衡的不是Al_(3)Fe相,而是一种组成符合化学式Al_(10)CaFe_(2)的三元化合物。通过包晶转变l+Al_(3)Fe→(Al)+Al_(10)CaFe_(2)(638℃,3.3%Ca和0.5%Fe,摩尔分数)发生从二元化合物到三元化合物的转变。与针状Al_(3)Fe相夹杂物不同,三元化合物的初晶和共晶具有致密的形貌。使用第一性原理计算和X射线衍射分析确定三元化合物Al_(10)CaFe_(2)的晶格结构。此外,近共晶合金Al-6%Ca-1%Fe(质量分数)在500~600℃退火后具有细晶组织,过量相的总体积分数约为25%。因此,Al-Ca-Fe体系可用于制造新的铝基复合合金。

关键词： Al-Ca合金金属间化合物相图相变显微组织铝基复合材料

Al-matrix composite based on Al-Ca-Ni-la system additionally reinforced by l12 type nanoparticles

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Transactions of Nonferrous Metals Society of China 2020年第4期30卷 850-862页

作者： Torgom K.AKOPYAN Nikolay A.BElOV Evgeniya A.naumova Nikolay V.lETYAGiN Tat'yana A.SViRiDOVA National University of Science and Technology MiSiS 4 Leninsky pr.Moscow 119049Russia

The structure of the quaternary Al?(2?4)wt.%Ca?Ni?la system near the aluminum corner has been studied using computational analysis in the Thermo-Calc program and experimental studies(electron microscopy,microprobe analysis and X-ray diffraction).Based on the phase equilibria data obtained,the experimental projection of the liquidus surface and solid state phase-field distribution of the Al?Ca?Ni?la system have been *** studies reveal that the alloys with the 2?4 wt.%Ca,2?4 wt.%Ni and 1?3 wt.%la ranges have an ultra-fine hypoeutectic structure with 30%volume fraction of eutectic intermetallics,which allows one to classify these alloys as natural Al-matrix *** ultra-fine eutectic structure produces significant strengthening,the magnitude of which can be well described using the modified Orowan looping mechanism *** additives of Zr and Sc(0.2 and 0.1 wt.%,respectively)lead to significant strengthening(by^25%)due to the formation of l12 type phase(Al3(Zr,Sc))nanoparticles during annealing of the alloy at 350?400℃.Due to the high volume fraction of eutectic intermetallics,the new alloys have low coefficients of thermal expansion and high thermal stability of the structure and mechanical properties.

关键词： Al-Ca alloys eutectic intermetallics phase diagram rare earth element nanocomposite microstructure mechanical properties

Formation and Characterization of AlCaFeCompound in Al-Ca-Fe Alloys

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Transactions of Nonferrous Metals Society of China 2023年

作者： N.A.Belov T.K.Akopyan E.A.naumova V.V.Doroshenko T.A.Sviridova N.O.Korotkova National University of Science and Technology MiSiS，4 leninsky pr. Baikov institute of Metallurgy and Materials Science，49 leninsky pr.

The phase diagram of the Al-Ca-Fe system in the aluminum corner， including the liquidus projection and solidification reactions， has been studied by using thermodynamic calculations and experimental techniques. it has been shown that instead of the Al3Fe phase， a ternary compound whose composition corresponds to the formula Al10CaFe2should be in equilibrium with the aluminum solid solution (Al). Thе transition from the binary to the ternary compound occurs via the peritectic transformation l+ Al3Fe → (Al) + Al10CaFe2(at 638 ℃， 3.3 at.% Ca and 0.5 at.% Fe ). Primary and eutectic crystals of the ternary compound have a compact morphology， in contrast to needle-shaped inclusions of the Al3Fe phase. Since the Al10CaFe2ternary compound has not been previously described in the literature， first principles calculations and X-ray diffraction analysis have been used to determine its crystal lattice structure. in addition， it has been shown that the near eutectic alloy Al–6 wt.%Ca–1 wt.%Fe after annealing at 500-600 ℃ has a fine structure with a total fraction of excess phases of about 25 vol.%. Thus， the Al-Ca-Fe system can be used to create new aluminum-matrix composite alloys.

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Sharp {111} texture in the industrial Tibearing interstitial free steel sheet

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广东有色金属学报 2005年第2期15卷 231-231页

作者： Slavov V.i. naumova O.M. Kuznetsov V.V. Strunina l.M. Naumov A.A. X-laboratory JSC"Severstal" Cherepovets 162600 Russia X-laboratory

The high r-value and strengthening n-coefficient is an important index to evaluate the formability of the steel sheet.

关键词：钛钢结构参数机械性能

Geochronology and origin of Paleoproterozoic charnockites with old crustal signature in the Haisyn block of the Ukrainian shield

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Acta Geochimica 2023年第3期42卷 393-408页

作者： M.Reshetnyk O.Zaiats l.Shumlyanskyy D.Starokadomsky l.Stepanyuk The National Museum of Natural History of the NAS of Ukraine 15Bohdan Khmelnytsky Str.Kyiv 01030Ukraine M.P.Semenenko institute of Geochemistry Mineralogy and Ore Formation of the NAS of Ukraine34Acad.Palladin Ave.Kyiv 03142Ukraine School of Earth and Planetary Sciences Curtin UniversityGPO Box U1987PerthWA 6845Australia Chuiko institute of Surface Chemistry of the NAS of Ukraine 17Generala Naumova Str.Kyiv 03164Ukraine

Results of a geochemical and geochronological study of the Paleoproterozoic rock assemblage in the Haisyn block of the Ros-Tikych Domain of the Ukrainian Shield are *** the block,the Haisyn Complex comprises granitoids,including pyroxene-bearing diorites,quartz diorites,granodiorites,amphibole-biotite and biotite granites,and aplite and pegmatite *** U-Pb isotope age of charnockitic syenite belonging to the Haisyn Complex was defined at 2027±6 *** age coeval with the time of granulite facies metamorphism and emplacement of numerous granitic intrusions in the *** Sm–Nd apatite isochron yielded an age of 2100±150 ***εNd isochron value of-5 indicates a long crustal residence time of the crustal *** data do not indicate any enrichment of the studied rocks in relation to the Eoarchean and Neoarchean charnockites developed in the same ***,if the model of partial melting of the older crustal protolith is involved then the degree of melting must be quite ***,deep negative anomalies of Sr,Eu,Zr,and Ti indicate that plagioclase,zircon,and Fe–Ti oxides probably remained unmelted in the *** Haisyn block was buried in the lower crust at high temperature and pressure conditions in the Paleoproterozoic *** a situation resulted in partial melting of the existing crust and formation of melts,containing undigested zircon and bearing ancient Nd isotope signature.

关键词： Paleoproterozoic Charnockite Ukrainian Shield U–Pb dating Crustal evolution

Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay

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Chinese Physics C 2021年第5期45卷 190-201页

作者： F.P.An A.B.Balantekin H.R.Band M.Bishai S.Blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.Y.Guo l.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.l.Jen X.l.Ji X.P.Ji R.A.Johnson D.Jones l.Kang S.H.Kettell S.Kohn M.Kramer T.J.langford J.lee J.H.C.lee R.T.lei R.leitner J.K.C.leung F.li J.J.li Q.J.li S.li S.C.li W.D.li X.N.li X.Q.li Y.F.li Z.B.li H.liang C.J.lin G.l.lin S.lin J.J.ling J.M.link l.littenberg B.R.littlejohn J.C.liu J.l.liu C.lu H.Q.lu J.S.lu K.B.luk X.B.Ma X.Y.Ma Y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.naumova J.P.Ochoa-Ricoux A.Oishevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner J.l.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei l.H.Wei l.J.Wen K.Whisnant C.G.White H.l.H.Wong E.Worcester D.R.Wu F.l.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing J.l.Xu T.Xu T.Xue C.G.Yang l.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.l.Young H.Z.Yu Z.Y.Yu B.B.Yue S.Zeng Y.Zeng l.Zhan C.Zhang F.Y.Zhang H.H.Zhang J.W.Zhang Q.M.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.J.Zhang Z.P.Zhang Z.Y.Zhang J.Zhao l.Zhou H.l.Zhuang J.H.Zou instiute of Modern Physics East China University of Science and TechnologyShanghai 200237 University of Wisconsin MadisonWisconsin 53706 Wright laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 Brookhaven National laboratory UptonNew York 11973 Department of Physics National Taiwan UniversityTaipei institute of High Energy Physics Beijing 100049 National United University Miao-Li Department of Engineering Physics Tsinghua UniversityBejing 100084 Shenzhen University Shenzhen 518060 Sun Yat-Sen(Zhongshan)University Guangzhou North China Electric Power University Bejjing 102206 Chinese University of Hong Kong Hong Kong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCaliformia 92697 University of Science and Technology of China Hefei 230026 Charles University Faculty of Mathematics and PhysicsPrague Department of Physics University of llinois at Urbana-ChampaignUrbanaIlinois 61801 lawrence Berkeley National laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 Joint institute for Nuclear Research DubnaMoscow Region Beijing Normal University Beijing 100875 Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Department of Physics University of HoustonHoustonTexas 77204 China institute of Atomic Energy Beijing 102413 Shandong University Jinan 250100 Guangxi University Nanning 530004 Center for Neutrino Physics Virginia TechBlacksburgVirginia 24061 institute of Physics National Chiao-Tung UniversityHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physies Collge of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHong Kong 999077 School

The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars *** the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW *** used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino *** detected electron-antineutrino candidates were consistent with the expected background rates for all the three time *** monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w *** the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows.

关键词： grav itational waves electron-antineutrinos fluence upper limit

Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications

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Chinese Physics C 2021年第7期45卷 1-19页

作者： F.P.An A.B.Balantekin M.Bishai S.Blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal D.Dolzhikov J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong M.Grassi W.Q.Gu J.Y.Guo l.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans a M.He K.M.Heeger Y.K.Heng Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang J.H.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.l.Jen X.l.Ji X.P.Ji R.A.Johnson D.Jones l.Kang S.H.Kettel S.Kohn M.Kramer T.J.langford J.lee J.H.C.lee R.T.lei R.leitner J.K.C.leung F.li H.l.li J.J.li Q.J.li R.H.li S.li S.C.li W.D.li X.N.li X.Q.li Y.F.li Z.B.li H.liang C.J.lin G.l.lin S.lin J.J.ling J.M.link26 l.littenberg B.R.littlejohn J.C.liu J.l.liu J.X.liu C.lu H.Q.lu K.B.luk B.Z.Ma X.B.Ma X.Y.Ma Y.Q.Ma R.C.Mandujano C.Marshall K.T.McDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.naumova T.M.T.Nguyen J.P.Ochoa-Ricoux A.Olshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner J.l.Sun T.Tmej1 K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei l.H.Wei l.J.Wen K.Whisnant C.G.White H.l.H.Wong E.Worcester D.R.Wu F.l.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing H.K.Xu J.l.Xu T.Xu T.Xue C.G.Yang l.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.l.Young H.Z.Yu Z.Y.Yu B.B.Yue V.Zavadskyi S.Zeng Y.Zeng l.Zhan C.Zhang F.Y.Zhang H.H.Zhang J.W.Zhang Q.M.Zhang S.Q.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.J.Zhang Z.P.Zhang Z.Y.Zhang J.Zhao R.Z.Zhao l.Zhou H.l.Zhuang J.H.Zou institute of Modern Physics East China University of Science and TechnologyShanghai 200337 University of Wisconsin MadisonWisconsin 53706 Brookhaven National laboratory UptonNew York 11973 Department of Physics Nnational Taiwan UniversityTaipei institute of High Energy Physics Beijing 100049 National United University Miao-Li Department of Engineering Physics Tsinghua UniversityBeijing 100048 Shenzhen University Shenzhen 518061 Sun Yat-Sen(Zhongshan)University Guangzhou 510275 North China Electric Power University Beijing 102206 Chinese University of Hong Kong Hongkong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697 University of Science and Technology of China Hefei 230022 Charles University Faculty of Mathematics and PhysicsPrague Joint institute for Nuclear Research DubnaMoscow Region Department of Physics University of Illinois at Urbana-ChampaignUrbanaIllinois 61801 lawrence Berkeley National laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 Beijing Normal University Beijing 100875 Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Wright laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 China institute of Atomic Energy Beijing 102413 Shandong University Jinan 250002 Guangxi University No.100 Daxue East RoadNanning 530004 Center for Neutrino Physics Virginia TechBlacksburgVirginia 24061 institute of Physics NCTUHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physics College of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHongkong 999077 School of Physics Nankai UniversityTianjin 300071 Department o

The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision *** positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment,in combination with the fission rates of fissile isotopes in the reactor,is used to extract the positron energy spectra resulting from the fission of specific *** information can be used to produce a precise,data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya *** positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding *** results are obtained with other unfolding methods.A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and *** the reactor fission fractions,the technique can predict the energy spectrum to a 2%*** addition,we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method.

关键词： reactor antineutrino energy spectrum Daya Bay application

improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

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Chinese Physics C 2017年第1期41卷 11-46页

作者：安丰鹏 A.B.Balantekin H.R.Band M.Bishai S.Blyth 曹德文曹国富曹俊岑吴镕陳日朗常劲帆張立楚张昀陈和生陈泉佑陈少敏陈义学陈羽程佳樺程捷程雅苹成兆侃 J.J.Cherwinka 朱明中 A.Chukanov J.P.Cummings J.de Arcos 邓子艳丁雪峰丁雅韵 M.V.Diwan M.Dolgareva J.Dove D.A.Dwyer W.R.Edwards R.Gill M.Gonchar 龚光华宫辉 M.Grassi 顾文强关梦云郭磊郭如盼郭新恒郭子溢 R.W.Hackenburg 韩然 S.Hans 何苗 K.M.Heeger 衡月昆 A.Higuera Y.K.Hor 熊怡胡貝禎胡涛胡维黄恩泉黄翰雄黄性涛 P.Huber 霍文驹 G.Hussain D.E.Jaffe P.Jaffke 任國綸 S.Jetter 季向盼季筱璐焦健斌 R.A.Johnson D.Jones J.Joshi 康丽 S.H.Kettell S.Kohn M.Kramer 關健强郭文伟郭天能 T.J.langford K.lau l.lebanowski J.lee 李曉菁雷瑞庭 R.leitner 李超李登杰李飞李高嵩李秋菊黎山峰 S.C.li 李卫东李小男李玉峰李志兵梁昊林政儒林贵林林盛鑫林士凱林禹丞凌家杰 J.M.link l.littenberg B.R.littlejohn 刘大为刘江来刘金昌 C.W.loh 陆昌国路浩奇陆稼书陆锦标吕志鹏马秋梅马晓妍马续波马宇倩 Y.Malyshkin D.A.Martinez Caicedo K.T.McDonald R.D.McKeown i.Mitchell M.Mooney Y.Nakajima J.Napolitano D.Naumov E.naumova 倪浩然宁哲 J.P.Ochoa-Ricoux A.Olshevskiy 潘孝儒 J.Park S.Patton V.Pec 彭仁杰 l.Pinsky 潘振声齐法制祁鸣钱鑫 N.Raper 任杰 R.Rosero B.Roskovec 阮锡超 H.Steiner 孙功星孙吉良唐炜 D.Taychenachev K.TVeskov K.V.Tsang C.E.Tull N.Viaux B.Viren V.Vorobei 王正祥王萌王乃彦王瑞光王为王玺王贻芳王喆王铮王志民魏瀚宇温良剑 K.Whisnant C.G.White l.Whitehead T.Wise 黄显诺黄振辉 E.Worcester 吳珈豪吴群吴文杰夏冬梅夏经凯邢志忠徐建一徐吉磊徐晔薛涛杨长根杨海波杨雷阳马生杨梦婷叶梅 Z.Ye 叶铭芳杨炳麟于泽源曾珊占亮张超张宏浩张家文张清民张玄同张一鸣张一心张玉美张志坚张智勇张子平赵洁赵庆旺赵豫斌钟玮丽周莉 N.Zhou 庄红林邹佳恒 institute of Modern Physics East China University of Science and Technology University of Wisconsin Department of Physics Yale University Brookhaven National laboratory Department of Physics National Taiwan University National United University Nanjing University institute of High Energy Physics Chinese University of Hong Kong institute of Physics National Chiao-Tung University Shandong University Department of Engineering Physics Tsinghua University North China Electric Power University Shenzhen University Sun Yat-Sen (Zhongshan) University Joint institute for Nuclear Research Siena College Department of Physics Illinois Institute of Technology Department of Physics University of Illinois at Urbana-Champaign lawrence Berkeley National laboratory Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Beijing Normal University Department of Chemistry and Chemical Technology Bronx Community College Department of Physics University of Houston Center for Neutrino Physics Virginia Tech China institute of Atomic Energy University of Science and Technology of China School of Physics Nankai University Department of Physics University of Cincinnati Department of Physics College of Science and Technology Temple University Dongguan University of Technology Department of Physics University of California Department of Physics The University of Hong Kong Charles University Faculty of Mathematics and Physics Joseph Henry laboratories Princeton University Department of Nuclear Science and Technology School of Energy and Power Engineering Xi’an Jiaotong University instituto de F'?sica Pontificia Universidad Católica de Chile California institute of Technology College of William and Mary Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute China General Nuclear Power Group College of Electronic Science and Engineering National University of Defense Technology iowa State University Chongqing University

A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（iBD） candidates were detected. The iBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ill＋Vogel） model. A 2.9σ deviation was found in the measured iBD positron energy spectrum compared to the predictions. in particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the iBD cross section is extracted for model-independent predictions.

关键词： antineutrino flux energy spectrum reactor Daya Bay