Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay.

Autor: An FP; Institute of Modern Physics, East China University of Science and Technology, Shanghai., Balantekin AB; University of Wisconsin, Madison, Wisconsin 53706., Band HR; Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520., Bishai M; Brookhaven National Laboratory, Upton, New York 11973., Blyth S; Department of Physics, National Taiwan University, Taipei.; National United University, Miao-Li., Cao D; Nanjing University, Nanjing., Cao GF; Institute of High Energy Physics, Beijing., Cao J; Institute of High Energy Physics, Beijing., Chan YL; Chinese University of Hong Kong, Hong Kong., Chang JF; Institute of High Energy Physics, Beijing., Chang Y; National United University, Miao-Li., Chen HS; Institute of High Energy Physics, Beijing., Chen QY; Shandong University, Jinan., Chen SM; Department of Engineering Physics, Tsinghua University, Beijing., Chen YX; North China Electric Power University, Beijing., Chen Y; Shenzhen University, Shenzhen., Cheng J; Shandong University, Jinan., Cheng ZK; Sun Yat-Sen (Zhongshan) University, Guangzhou., Cherwinka JJ; University of Wisconsin, Madison, Wisconsin 53706., Chu MC; Chinese University of Hong Kong, Hong Kong., Chukanov A; Joint Institute for Nuclear Research, Dubna, Moscow Region., Cummings JP; Siena College, Loudonville, New York 12211., Ding YY; Institute of High Energy Physics, Beijing., Diwan MV; Brookhaven National Laboratory, Upton, New York 11973., Dolgareva M; Joint Institute for Nuclear Research, Dubna, Moscow Region., Dove J; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801., Dwyer DA; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Edwards WR; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Gill R; Brookhaven National Laboratory, Upton, New York 11973., Gonchar M; Joint Institute for Nuclear Research, Dubna, Moscow Region., Gong GH; Department of Engineering Physics, Tsinghua University, Beijing., Gong H; Department of Engineering Physics, Tsinghua University, Beijing., Grassi M; Institute of High Energy Physics, Beijing., Gu WQ; Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai., Guo L; Department of Engineering Physics, Tsinghua University, Beijing., Guo XH; Beijing Normal University, Beijing., Guo YH; Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an., Guo Z; Department of Engineering Physics, Tsinghua University, Beijing., Hackenburg RW; Brookhaven National Laboratory, Upton, New York 11973., Hans S; Brookhaven National Laboratory, Upton, New York 11973., He M; Institute of High Energy Physics, Beijing., Heeger KM; Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520., Heng YK; Institute of High Energy Physics, Beijing., Higuera A; Department of Physics, University of Houston, Houston, Texas 77204., Hsiung YB; Department of Physics, National Taiwan University, Taipei., Hu BZ; Department of Physics, National Taiwan University, Taipei., Hu T; Institute of High Energy Physics, Beijing., Huang EC; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801., Huang HX; China Institute of Atomic Energy, Beijing., Huang XT; Shandong University, Jinan., Huang YB; Institute of High Energy Physics, Beijing., Huber P; Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061., Huo W; University of Science and Technology of China, Hefei., Hussain G; Department of Engineering Physics, Tsinghua University, Beijing., Jaffe DE; Brookhaven National Laboratory, Upton, New York 11973., Jen KL; Institute of Physics, National Chiao-Tung University, Hsinchu., Ji XP; Department of Engineering Physics, Tsinghua University, Beijing.; School of Physics, Nankai University, Tianjin., Ji XL; Institute of High Energy Physics, Beijing., Jiao JB; Shandong University, Jinan., Johnson RA; Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221., Jones D; Department of Physics, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122., Kang L; Dongguan University of Technology, Dongguan., Kettell SH; Brookhaven National Laboratory, Upton, New York 11973., Khan A; Sun Yat-Sen (Zhongshan) University, Guangzhou., Kohn S; Department of Physics, University of California, Berkeley, California 94720., Kramer M; Lawrence Berkeley National Laboratory, Berkeley, California 94720.; Department of Physics, University of California, Berkeley, California 94720., Kwan KK; Chinese University of Hong Kong, Hong Kong., Kwok MW; Chinese University of Hong Kong, Hong Kong., Langford TJ; Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520., Lau K; Department of Physics, University of Houston, Houston, Texas 77204., Lebanowski L; Department of Engineering Physics, Tsinghua University, Beijing., Lee J; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Lee JHC; Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong., Lei RT; Dongguan University of Technology, Dongguan., Leitner R; Charles University, Faculty of Mathematics and Physics, Prague., Leung JKC; Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong., Li C; Shandong University, Jinan., Li DJ; University of Science and Technology of China, Hefei., Li F; Institute of High Energy Physics, Beijing., Li GS; Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai., Li QJ; Institute of High Energy Physics, Beijing., Li S; Dongguan University of Technology, Dongguan., Li SC; Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061., Li WD; Institute of High Energy Physics, Beijing., Li XN; Institute of High Energy Physics, Beijing., Li XQ; School of Physics, Nankai University, Tianjin., Li YF; Institute of High Energy Physics, Beijing., Li ZB; Sun Yat-Sen (Zhongshan) University, Guangzhou., Liang H; University of Science and Technology of China, Hefei., Lin CJ; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Lin GL; Institute of Physics, National Chiao-Tung University, Hsinchu., Lin S; Dongguan University of Technology, Dongguan., Lin SK; Department of Physics, University of Houston, Houston, Texas 77204., Lin YC; Department of Physics, National Taiwan University, Taipei., Ling JJ; Sun Yat-Sen (Zhongshan) University, Guangzhou., Link JM; Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061., Littenberg L; Brookhaven National Laboratory, Upton, New York 11973., Littlejohn BR; Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616., Liu JL; Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai., Liu JC; Institute of High Energy Physics, Beijing., Loh CW; Nanjing University, Nanjing., Lu C; Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544., Lu HQ; Institute of High Energy Physics, Beijing., Lu JS; Institute of High Energy Physics, Beijing., Luk KB; Lawrence Berkeley National Laboratory, Berkeley, California 94720.; Department of Physics, University of California, Berkeley, California 94720., Ma XY; Institute of High Energy Physics, Beijing., Ma XB; North China Electric Power University, Beijing., Ma YQ; Institute of High Energy Physics, Beijing., Malyshkin Y; Instituto de Física, Pontificia Universidad Católica de Chile, Santiago., Martinez Caicedo DA; Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616., McDonald KT; Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544., McKeown RD; California Institute of Technology, Pasadena, California 91125.; College of William and Mary, Williamsburg, Virginia 23187., Mitchell I; Department of Physics, University of Houston, Houston, Texas 77204., Nakajima Y; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Napolitano J; Department of Physics, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122., Naumov D; Joint Institute for Nuclear Research, Dubna, Moscow Region., Naumova E; Joint Institute for Nuclear Research, Dubna, Moscow Region., Ngai HY; Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong., Ochoa-Ricoux JP; Instituto de Física, Pontificia Universidad Católica de Chile, Santiago., Olshevskiy A; Joint Institute for Nuclear Research, Dubna, Moscow Region., Pan HR; Department of Physics, National Taiwan University, Taipei., Park J; Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061., Patton S; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Pec V; Charles University, Faculty of Mathematics and Physics, Prague., Peng JC; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801., Pinsky L; Department of Physics, University of Houston, Houston, Texas 77204., Pun CSJ; Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong., Qi FZ; Institute of High Energy Physics, Beijing., Qi M; Nanjing University, Nanjing., Qian X; Brookhaven National Laboratory, Upton, New York 11973., Qiu RM; North China Electric Power University, Beijing., Raper N; Sun Yat-Sen (Zhongshan) University, Guangzhou.; Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180., Ren J; China Institute of Atomic Energy, Beijing., Rosero R; Brookhaven National Laboratory, Upton, New York 11973., Roskovec B; Charles University, Faculty of Mathematics and Physics, Prague., Ruan XC; China Institute of Atomic Energy, Beijing., Steiner H; Lawrence Berkeley National Laboratory, Berkeley, California 94720.; Department of Physics, University of California, Berkeley, California 94720., Stoler P; Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180., Sun JL; China General Nuclear Power Group, Shenzhen., Tang W; Brookhaven National Laboratory, Upton, New York 11973., Taychenachev D; Joint Institute for Nuclear Research, Dubna, Moscow Region., Treskov K; Joint Institute for Nuclear Research, Dubna, Moscow Region., Tsang KV; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Tull CE; Lawrence Berkeley National Laboratory, Berkeley, California 94720., Viaux N; Instituto de Física, Pontificia Universidad Católica de Chile, Santiago., Viren B; Brookhaven National Laboratory, Upton, New York 11973., Vorobel V; Charles University, Faculty of Mathematics and Physics, Prague., Wang CH; National United University, Miao-Li., Wang M; Shandong University, Jinan., Wang NY; Beijing Normal University, Beijing., Wang RG; Institute of High Energy Physics, Beijing., Wang W; Sun Yat-Sen (Zhongshan) University, Guangzhou.; College of William and Mary, Williamsburg, Virginia 23187., Wang X; College of Electronic Science and Engineering, National University of Defense Technology, Changsha., Wang YF; Institute of High Energy Physics, Beijing., Wang Z; Department of Engineering Physics, Tsinghua University, Beijing., Wang Z; Institute of High Energy Physics, Beijing., Wang ZM; Institute of High Energy Physics, Beijing., Wei HY; Department of Engineering Physics, Tsinghua University, Beijing., Wen LJ; Institute of High Energy Physics, Beijing., Whisnant K; Iowa State University, Ames, Iowa 50011., White CG; Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616., Whitehead L; Department of Physics, University of Houston, Houston, Texas 77204., Wise T; Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520., Wong HLH; Lawrence Berkeley National Laboratory, Berkeley, California 94720.; Department of Physics, University of California, Berkeley, California 94720., Wong SCF; Sun Yat-Sen (Zhongshan) University, Guangzhou., Worcester E; Brookhaven National Laboratory, Upton, New York 11973., Wu CH; Institute of Physics, National Chiao-Tung University, Hsinchu., Wu Q; Shandong University, Jinan., Wu WJ; Institute of High Energy Physics, Beijing., Xia DM; Chongqing University, Chongqing., Xia JK; Institute of High Energy Physics, Beijing., Xing ZZ; Institute of High Energy Physics, Beijing., Xu JL; Institute of High Energy Physics, Beijing., Xu Y; Sun Yat-Sen (Zhongshan) University, Guangzhou., Xue T; Department of Engineering Physics, Tsinghua University, Beijing., Yang CG; Institute of High Energy Physics, Beijing., Yang H; Nanjing University, Nanjing., Yang L; Dongguan University of Technology, Dongguan., Yang MS; Institute of High Energy Physics, Beijing., Yang MT; Shandong University, Jinan., Yang YZ; Sun Yat-Sen (Zhongshan) University, Guangzhou., Ye M; Institute of High Energy Physics, Beijing., Ye Z; Department of Physics, University of Houston, Houston, Texas 77204., Yeh M; Brookhaven National Laboratory, Upton, New York 11973., Young BL; Iowa State University, Ames, Iowa 50011., Yu ZY; Institute of High Energy Physics, Beijing., Zeng S; Institute of High Energy Physics, Beijing., Zhan L; Institute of High Energy Physics, Beijing., Zhang C; Brookhaven National Laboratory, Upton, New York 11973., Zhang CC; Institute of High Energy Physics, Beijing., Zhang HH; Sun Yat-Sen (Zhongshan) University, Guangzhou., Zhang JW; Institute of High Energy Physics, Beijing., Zhang QM; Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an., Zhang R; Nanjing University, Nanjing., Zhang XT; Institute of High Energy Physics, Beijing., Zhang YM; Department of Engineering Physics, Tsinghua University, Beijing., Zhang YX; China General Nuclear Power Group, Shenzhen., Zhang YM; Sun Yat-Sen (Zhongshan) University, Guangzhou., Zhang ZJ; Dongguan University of Technology, Dongguan., Zhang ZY; Institute of High Energy Physics, Beijing., Zhang ZP; University of Science and Technology of China, Hefei., Zhao J; Institute of High Energy Physics, Beijing., Zhou L; Institute of High Energy Physics, Beijing., Zhuang HL; Institute of High Energy Physics, Beijing., Zou JH; Institute of High Energy Physics, Beijing.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2017 Jun 23; Vol. 118 (25), pp. 251801. Date of Electronic Publication: 2017 Jun 19.
DOI: 10.1103/PhysRevLett.118.251801
Abstrakt: 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 ^{239}Pu fission fractions F_{239} from 0.25 to 0.35, Daya Bay measures an average IBD yield σ[over ¯]_{f} of (5.90±0.13)×10^{-43}  cm^{2}/fission and a fuel-dependent variation in the IBD yield, dσ_{f}/dF_{239}, of (-1.86±0.18)×10^{-43}  cm^{2}/fission. This observation rejects the hypothesis of a constant antineutrino flux as a function of the ^{239}Pu 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 3.1σ. 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 ^{235}U, ^{239}Pu, ^{238}U, and ^{241}Pu. Based on measured IBD yield variations, yields of (6.17±0.17) and (4.27±0.26)×10^{-43}  cm^{2}/fission have been determined for the two dominant fission parent isotopes ^{235}U and ^{239}Pu. A 7.8% discrepancy between the observed and predicted ^{235}U yields suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.
Databáze: MEDLINE