文献类型：期刊文献

英文题名：Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

作者：An, F. P.[1];Balantekin, A. B.[2];Band, H. R.[3,4];Bishai, M.[5];Blyth, S.[6,7];Cao, D.[8];Cao, G. F.[9];Cao, J.[9];Chan, Y. L.[10];Chang, J. F.[9];Chang, Y.[7];Chen, H. S.[9];Chen, Q. Y.[11];Chen, S. M.[12];Chen, Y. X.[13];Chen, Y.[14];Cheng, J.[11];Cheng, Z. K.[15];Cherwinka, J. J.[2];Chu, M. C.[10];Chukanov, A.[16];Cummings, J. P.[17];Ding, Y. Y.[9];Diwan, M. V.[5];Dolgareva, M.[16];Dove, J.[18];Dwyer, D. A.[19];Edwards, W. R.[19];Gill, R.[5];Gonchar, M.[16];Gong, G. H.[12];Gong, H.[12];Grassi, M.[9];Gu, W. Q.[20];Guo, L.[12];Guo, X. H.[21];Guo, Y. H.[12,22];Guo, Z.;Hackenburg, R. W.[5];Hans, S.[5];He, M.;Heeger, K. M.[4];Heng, Y. K.[9];Higuera, A.[23];Hsiung, Y. B.[6];Hu, B. Z.[6];Hu, T.[9];Huang, E. C.[18];Huang, H. X.[24];Huang, X. T.[11];Huang, Y. B.[9];Huber, P.[25];Huo, W.[26];Hussain, G.[12];Jaffe, D. E.[5];Jen, K. L.[27];Ji, X. P.[28];Ji, X. L.[9];Jiao, J. B.[11];Johnson, R. A.[29];Jones, D.[30];Kang, L.[31];Kettell, S. H.[5];Khan, A.[15];Kohn, S.[32];Kramer, M.[19,32];Kwan, K. K.[10];Kwok, M. W.[10];Langford, T. J.[4];Lau, K.[23];Lebanowski, L.[12];Lee, J.[19];Lee, J. H. C.[33];Lei, R. T.[31];Leitner, R.[34];Leung, J. K. C.[33];Li, C.;Li, D. J.[11];Li, F.[9];Li, G. S.[20];Li, Q. J.;Li, S.[31];Li, S. C.[25];Li, W. D.[9];Li, X. N.[9];Li, X. Q.[28];Li, Y. F.[9];Li, Z. B.[15];Liang, H.[26];Lin, C. J.[19];Lin, G. L.[27];Lin, S.[31];Lin, S. K.[23];Lin, Y. -C.[6];Ling, J. J.[15];Link, J. M.[15];Littenberg, L.[5];Littlejohn, B. R.[35];Liu, J. L.[20];Liu, J. C.[9];Loh, C. W.[8];Lu, C.[36];Lu, H. Q.[9];Lu, J. S.[2,9];Luk, K. B.[19,32];Ma, X. Y.[9];Ma, X. B.[13];Ma, Y. Q.[9];Malyshkin, Y.[37];Caicedo, D. A. Martinez[35];McDonald, K. T.[36];McKeown, R. D.[38,39];Mitchell, I.[23];Nakajima, Y.[19];Napolitano, J.[30];Naumov, D.[16];Naumova, E.[16];Ngai, H. Y.[16];Ochoa-Ricoux, J. P.[37];Olshevskiy, A.[16];Pan, H. -R.[6];Park, J.[25];Patton, S.[19];Pec, V.[34];Peng, J. C.[18];Pinsky, L.[23];Pun, C. S. J.[33];Qi, F. Z.;Qi, M.[8];Qian, X.[5];Qiu, R. M.[13];Raper, N.[15,40];Ren, J.[24];Rosero, R.[5];Roskovec, B.[34];Ruan, X. C.[24];Steiner, H.[19,32];Stoler, P.[40];Sun, J. L.[41];Tang, W.[5];Taychenachev, D.[16];Treskov, K.[16];Tsang, K. V.[19];Tull, C. E.[19];Viaux, N.[37];Viren, B.[5];Vorobel, V.[34];Wang, C. H.[7];Wang, M.[11];Wang, N. Y.[21];Wang, R. G.[9];Wang, W.[15,39];Wang, X.[42];Wang, Y. F.[9];Wang, Z.[9,12];Wang, Z. M.[9];Wei, H. Y.[12];Wen, L. J.[9];Whisnant, K.;White, C. G.;Whitehead, L.;Wise, T.;Wong, H. L. H.;Wong, S. C. F.;Worcester, E.;Wu, C. -H.;Wu, Q.;Wu, W. J.[9];Xia, D. M.;Xia, J. K.[9];Xing, Z. Z.[9];Xu, J. L.[9];Xu, Y.[15];Xue, T.[12];Yang, C. G.[9];Yang, H.[8];Yang, L.[31];Yang, M. S.[9];Yang, M. T.[11];Yang, Y. Z.[15];Ye, M.[9];Ye, Z.[23];Yeh, M.[5];Young, B. L.[43];Yu, Z. Y.[9];Zeng, S.[9];Zhan, L.;Zhang, C.[5];Zhang, C. C.[9];Zhang, H. H.;Zhang, J. W.[9];Zhang, Q. M.[22];Zhang, R.[8];Zhang, X. T.[9];Zhang, Y. X.;Zhang, Y. M.[12,15,41];Zhang, Z. J.[31];Zhang, Z. Y.[9];Zhang, Z. P.[26];Zhao, J.[9];Zhou, L.;Zhuang, H. L.[9];Zou, J. H.[9]

机构：[1]East China Univ Sci & Technol, Inst Modern Phys, Shanghai, Peoples R China;[2]Univ Wisconsin, Madison, WI 53706 USA;[3]Yale Univ, Wright Lab, New Haven, CT 06520 USA;[4]Yale Univ, Dept Phys, New Haven, CT 06520 USA;[5]Brookhaven Natl Lab, Upton, NY 11973 USA;[6]Natl Taiwan Univ, Dept Phys, Taipei, Taiwan;[7]Natl United Univ, Miaoli, Taiwan;[8]Nanjing Univ, Nanjing, Peoples R China;[9]Inst High Energy Phys, Beijing, Peoples R China;[10]Chinese Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China;[11]Shandong Univ, Jinan, Peoples R China;[12]Tsinghua Univ, Dept Engn Phys, Beijing, Peoples R China;[13]North China Elect Power Univ, Beijing, Peoples R China;[14]Shenzhen Univ, Shenzhen, Peoples R China;[15]Sun Yat Sen Univ, Guangzhou, Guangdong, Peoples R China;[16]Joint Inst Nucl Res, Moscow, Russia;[17]Siena Coll, Loudonville, NY 12211 USA;[18]Univ Illinois, Dept Phys, Urbana, IL 61801 USA;[19]Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA;[20]Shanghai Jiao Tong Univ, Shanghai Lab Particle Phys & Cosmol, Dept Phys & Astron, Shanghai, Peoples R China;[21]Beijing Normal Univ, Beijing, Peoples R China;[22]Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Nucl Sci & Technol, Xian, Peoples R China;[23]Univ Houston, Dept Phys, Houston, TX 77204 USA;[24]China Inst Atom Energy, Beijing, Peoples R China;[25]Virginia Tech, Ctr Neutrino Phys, Blacksburg, VA 24061 USA;[26]Univ Sci & Technol China, Hefei, Peoples R China;[27]Natl Chiao Tung Univ, Inst Phys, Hsinchu, Taiwan;[28]Nankai Univ, Sch Phys, Tianjin, Peoples R China;[29]Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA;[30]Temple Univ, Coll Sci & Technol, Dept Phys, Philadelphia, PA 19122 USA;[31]Dongguan Univ Technol, Dongguan, Guangdong, Peoples R China;[32]Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;[33]Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong, Peoples R China;[34]Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic;[35]IIT, Dept Phys, Chicago, IL 60616 USA;[36]Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA;[37]Pontificia Univ Catolica Chile, Inst Fis, Santiago, Chile;[38]CALTECH, Pasadena, CA 91125 USA;[39]Coll William & Mary, Williamsburg, VA 23187 USA;[40]Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA;[41]China Gen Nucl Power Grp, Shenzhen, Peoples R China;[42]Natl Univ Def Technol, Coll Elect Sci & Engn, Changsha, Hunan, Peoples R China;[43]Iowa State Univ, Ames, IA 50011 USA; Chongqing Univ, Chongqing, Peoples R China

年份：2017

卷号：118

期号：25

外文期刊名：PHYSICAL REVIEW LETTERS

收录：;EI(收录号：20172603846620);WOS:【SCI-EXPANDED(收录号:WOS:000403560000001)】；

基金：Daya Bay is supported in part by the Ministry of Science and Technology of China, the U.S. Department of Energy, the Chinese Academy of Sciences, the CAS Center for Excellence in Particle Physics, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China General Nuclear Power Group, Key Laboratory of Particle and Radiation Imaging (Tsinghua University), the Ministry of Education, Key Laboratory of Particle Physics and Particle Irradiation (Shandong University), the Ministry of Education, Shanghai Laboratory for Particle Physics and Cosmology, the Research Grants Council of the Hong Kong Special Administrative Region of China, the University Development Fund of The University of Hong Kong, the MOE program for Research of Excellence at National Taiwan University, National Chiao-Tung University, and NSC fund support from Taiwan, the U.S. National Science Foundation, the Alfred P. Sloan Foundation, the Ministry of Education, Youth, and Sports of the Czech Republic, the Joint Institute of Nuclear Research in Dubna, Russia, the National Commission of Scientific and Technological Research of Chile, and the Tsinghua University Initiative Scientific Research Program. We acknowledge Yellow River Engineering Consulting Co., Ltd., and China Railway 15th Bureau Group Co., Ltd., for building the underground laboatory. We are grateful for the ongoing cooperation from the China General Nuclear Power Group and China Light and Power Company.

语种：英文

外文关键词：Forecasting - Nuclear fuels - Nuclear power plants - Spectroscopy - Statistics

摘要：The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of six 2.9 GW(th) reactor cores at the Daya Bay and Ling Ao nuclear power plants. Using detector data spanning effective Pu-239 fission fractions F-239 from 0.25 to 0.35, Daya Bay measures an average IBD yield (sigma) over bar (f) of (5.90 +/- 0.13) x 10(-43) cm(2)/fission and a fuel-dependent variation in the IBD yield, d sigma(f)/dF(239), of (-1.86 +/- 0.18) x 10(-43) cm(2)/fission. This observation rejects the hypothesis of a constant antineutrino flux as a function of the Pu-239 fission fraction at 10 standard deviations. The variation in IBD yield is found to be energy dependent, rejecting the hypothesis of a constant antineutrino energy spectrum at 5.1 standard deviations. While measurements of the evolution in the IBD spectrum show general agreement with predictions from recent reactor models, the measured evolution in total IBD yield disagrees with recent predictions at 3.1 sigma. This discrepancy indicates that an overall deficit in the measured flux with respect to predictions does not result from equal fractional deficits from the primary fission isotopes U-235, Pu-239, U-238, and Pu-241. Based on measured IBD yield variations, yields of (6.17 +/- 0.17) and (4.27 +/- 0.26) x 10(-43) cm(2)/fission have been determined for the two dominant fission parent isotopes U-235 and Pu-239. A 7.8% discrepancy between the observed and predicted U-235 yields suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.