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Extraction of the ^{235}U and ^{239}Pu Antineutrino Spectra at Daya Bay.

  • Author(s): Adey, D;
  • An, FP;
  • Balantekin, AB;
  • Band, HR;
  • Bishai, M;
  • Blyth, S;
  • Cao, D;
  • Cao, GF;
  • Cao, J;
  • Chang, JF;
  • Chang, Y;
  • Chen, HS;
  • Chen, SM;
  • Chen, Y;
  • Chen, YX;
  • Cheng, J;
  • Cheng, ZK;
  • Cherwinka, JJ;
  • Chu, MC;
  • Chukanov, A;
  • Cummings, JP;
  • Dash, N;
  • Deng, FS;
  • Ding, YY;
  • Diwan, MV;
  • Dohnal, T;
  • Dove, J;
  • Dvořák, M;
  • Dwyer, DA;
  • Gonchar, M;
  • Gong, GH;
  • Gong, H;
  • Gu, WQ;
  • Guo, JY;
  • Guo, L;
  • Guo, XH;
  • Guo, YH;
  • Guo, Z;
  • Hackenburg, RW;
  • Hans, S;
  • He, M;
  • Heeger, KM;
  • Heng, YK;
  • Higuera, A;
  • Hor, YK;
  • Hsiung, YB;
  • Hu, BZ;
  • Hu, JR;
  • Hu, T;
  • Hu, ZJ;
  • Huang, HX;
  • Huang, XT;
  • Huang, YB;
  • Huber, P;
  • Jaffe, DE;
  • Jen, KL;
  • Ji, XL;
  • Ji, XP;
  • Johnson, RA;
  • Jones, D;
  • Kang, L;
  • Kettell, SH;
  • Koerner, LW;
  • Kohn, S;
  • Kramer, M;
  • Langford, TJ;
  • Lee, J;
  • Lee, JHC;
  • Lei, RT;
  • Leitner, R;
  • Leung, JKC;
  • Li, C;
  • Li, F;
  • Li, HL;
  • Li, QJ;
  • Li, S;
  • Li, SC;
  • Li, SJ;
  • Li, WD;
  • Li, XN;
  • Li, XQ;
  • Li, YF;
  • Li, ZB;
  • Liang, H;
  • Lin, CJ;
  • Lin, GL;
  • Lin, S;
  • Ling, JJ;
  • Link, JM;
  • Littenberg, L;
  • Littlejohn, BR;
  • Liu, JC;
  • Liu, JL;
  • Liu, Y;
  • Liu, YH;
  • Lu, C;
  • Lu, HQ;
  • Lu, JS;
  • Luk, KB;
  • Ma, XB;
  • Ma, XY;
  • Ma, YQ;
  • Marshall, C;
  • Martinez Caicedo, DA;
  • McDonald, KT;
  • McKeown, RD;
  • Mitchell, I;
  • Mora Lepin, L;
  • Napolitano, J;
  • Naumov, D;
  • Naumova, E;
  • Ochoa-Ricoux, JP;
  • Olshevskiy, A;
  • Pan, H-R;
  • Park, J;
  • Patton, S;
  • Pec, V;
  • Peng, JC;
  • Pinsky, L;
  • Pun, CSJ;
  • Qi, FZ;
  • Qi, M;
  • Qian, X;
  • Raper, N;
  • Ren, J;
  • Rosero, R;
  • Roskovec, B;
  • Ruan, XC;
  • Steiner, H;
  • Sun, JL;
  • Treskov, K;
  • Tse, W-H;
  • Tull, CE;
  • Viren, B;
  • Vorobel, V;
  • Wang, CH;
  • Wang, J;
  • Wang, M;
  • Wang, NY;
  • Wang, RG;
  • Wang, W;
  • Wang, W;
  • Wang, X;
  • Wang, Y;
  • Wang, YF;
  • Wang, Z;
  • Wang, Z;
  • Wang, ZM;
  • Wei, HY;
  • Wei, LH;
  • Wen, LJ;
  • Whisnant, K;
  • White, CG;
  • Wong, HLH;
  • Wong, SCF;
  • Worcester, E;
  • Wu, Q;
  • Wu, WJ;
  • Xia, DM;
  • Xing, ZZ;
  • Xu, JL;
  • Xue, T;
  • Yang, CG;
  • Yang, L;
  • Yang, MS;
  • Yang, YZ;
  • Ye, M;
  • Yeh, M;
  • Young, BL;
  • Yu, HZ;
  • Yu, ZY;
  • Yue, BB;
  • Zeng, S;
  • Zeng, Y;
  • Zhan, L;
  • Zhang, C;
  • Zhang, CC;
  • Zhang, FY;
  • Zhang, HH;
  • Zhang, JW;
  • Zhang, QM;
  • Zhang, R;
  • Zhang, XF;
  • Zhang, XT;
  • Zhang, YM;
  • Zhang, YM;
  • Zhang, YX;
  • Zhang, YY;
  • Zhang, ZJ;
  • Zhang, ZP;
  • Zhang, ZY;
  • Zhao, J;
  • Zhou, L;
  • Zhuang, HL;
  • Zou, JH;
  • Daya Bay Collaboration
  • et al.
Abstract

This Letter reports the first extraction of individual antineutrino spectra from ^{235}U and ^{239}Pu fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5×10^{6} inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, ^{235}U and ^{239}Pu, are extracted using the evolution of the prompt spectrum as a function of the isotope fission fractions. In the energy window of 4-6 MeV, a 7% (9%) excess of events is observed for the ^{235}U (^{239}Pu) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for ^{235}U spectral shape compared with the Huber-Mueller model prediction. The shape of the measured inverse beta-decay prompt energy spectrum disagrees with the prediction of the Huber-Mueller model at 5.3σ. In the energy range of 4-6 MeV, a maximal local discrepancy of 6.3σ is observed.

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