Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay

D. Adey; F. P. An; A. B. Balantekin; H. R. Band; M. Bishai; S. Blyth; D. Cao; 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; A. Chukanov; J. P. Cummings; N. Dash; F. S. Deng; Y. Y. Ding; M. V. Diwan; T. Dohnal; J. Dove; M. Dvořák; D. A. Dwyer; 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; L. W. Koerner; S. Kohn; M. Kramer; T. J. Langford; J. H.C. Lee; R. T. Lei; R. Leitner; J. K.C. Leung; C. Li; F. Li; H. L. Li; Q. J. Li; S. Li; S. C. Li; S. J. 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; Y. Liu; Y. H. 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. McDonald; R. D. McKeown; I. Mitchell; L. Mora Lepin; J. Napolitano; D. Naumov; E. Naumova; J. P. Ochoa-Ricoux; A. Olshevskiy; H. R. Pan; J. Park; S. Patton; V. Pec; J. C. Peng; L. Pinsky; C. S.J. Pun; F. Z. Qi; M. Qi; X. Qian; N. Raper; J. Ren; R. Rosero; B. Roskovec; X. C. Ruan; H. Steiner; J. L. Sun; 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; S. C.F. Wong; E. Worcester; Q. Wu; W. J. Wu; D. M. Xia; Z. Z. Xing; J. L. Xu; T. Xue; C. G. Yang; L. Yang; M. S. Yang; Y. Z. Yang; M. Ye; M. Yeh; B. L. Young; H. Z. Yu; Z. Y. Yu; B. B. Yue; S. Zeng; Y. Zeng; L. Zhan; C. Zhang; C. C. Zhang; F. Y. Zhang; H. H. Zhang; J. W. Zhang; Q. M. Zhang; R. Zhang; X. F. Zhang; X. T. Zhang; Y. M. 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

doi:10.1103/PhysRevLett.123.111801

Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay

D. Adey, F. P. An, A. B. Balantekin, H. R. Band, M. Bishai, S. Blyth, D. Cao, 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, A. ChukanovJ. P. Cummings, N. Dash, F. S. Deng, Y. Y. Ding, M. V. Diwan, T. Dohnal, J. Dove, M. Dvořák, D. A. Dwyer, 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, L. W. Koerner, S. Kohn, M. Kramer, T. J. Langford, J. H.C. Lee, R. T. Lei, R. Leitner, J. K.C. Leung, C. Li, F. Li, H. L. Li, Q. J. Li, S. Li, S. C. Li, S. J. 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, Y. Liu, Y. H. 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. McDonald, R. D. McKeown, I. Mitchell, L. Mora Lepin, J. Napolitano, D. Naumov, E. Naumova, J. P. Ochoa-Ricoux, A. Olshevskiy, H. R. Pan, J. Park, S. Patton, V. Pec, J. C. Peng, L. Pinsky, C. S.J. Pun, F. Z. Qi, M. Qi, X. Qian, N. Raper, J. Ren, R. Rosero, B. Roskovec, X. C. Ruan, H. Steiner, J. L. Sun, 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, S. C.F. Wong, E. Worcester, Q. Wu, W. J. Wu, D. M. Xia, Z. Z. Xing, J. L. Xu, T. Xue, C. G. Yang, L. Yang, M. S. Yang, Y. Z. Yang, M. Ye, M. Yeh, B. L. Young, H. Z. Yu, Z. Y. Yu, B. B. Yue, S. Zeng, Y. Zeng, L. Zhan, C. Zhang, C. C. Zhang, F. Y. Zhang, H. H. Zhang, J. W. Zhang, Q. M. Zhang, R. Zhang, X. F. Zhang, X. T. Zhang, Y. M. 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

Center for High Energy and High Field Physics

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

This Letter reports the first extraction of individual antineutrino spectra from U235 and Pu239 fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5×106 inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, U235 and Pu239, 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 U235 (Pu239) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for U235 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.

Original language	English
Article number	111801
Journal	Physical Review Letters
Volume	123
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.123.111801
State	Published - 13 Sep 2019

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10.1103/PhysRevLett.123.111801

Cite this

Adey, D., An, F. P., Balantekin, A. B., Band, H. R., Bishai, M., Blyth, S., Cao, D., Cao, G. F., Cao, J., Chang, J. F., Chang, Y., Chen, H. S., Chen, S. M., Chen, Y., Chen, Y. X., Cheng, J., Cheng, Z. K., Cherwinka, J. J., Chu, M. C., ... Zou, J. H. (2019). Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay. Physical Review Letters, 123(11), Article 111801. https://doi.org/10.1103/PhysRevLett.123.111801

@article{3d61062750a94f60a35912e5a769248f,

title = "Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay",

abstract = "This Letter reports the first extraction of individual antineutrino spectra from U235 and Pu239 fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5×106 inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, U235 and Pu239, 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 U235 (Pu239) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for U235 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.",

author = "D. Adey and An, {F. P.} and Balantekin, {A. B.} and Band, {H. R.} and M. Bishai and S. Blyth and D. Cao and Cao, {G. F.} and J. Cao and Chang, {J. F.} and Y. Chang and Chen, {H. S.} and Chen, {S. M.} and Y. Chen and Chen, {Y. X.} and J. Cheng and Cheng, {Z. K.} and Cherwinka, {J. J.} and Chu, {M. C.} and A. Chukanov and Cummings, {J. P.} and N. Dash and Deng, {F. S.} and Ding, {Y. Y.} and Diwan, {M. V.} and T. Dohnal and J. Dove and M. Dvo{\v r}{\'a}k and Dwyer, {D. A.} and M. Gonchar and Gong, {G. H.} and H. Gong and Gu, {W. Q.} and Guo, {J. Y.} and L. Guo and Guo, {X. H.} and Guo, {Y. H.} and Z. Guo and Hackenburg, {R. W.} and S. Hans and M. He and Heeger, {K. M.} and Heng, {Y. K.} and A. Higuera and Hor, {Y. K.} and Hsiung, {Y. B.} and Hu, {B. Z.} and Hu, {J. R.} and T. Hu and Hu, {Z. J.} and Huang, {H. X.} and Huang, {X. T.} and Huang, {Y. B.} and P. Huber and Jaffe, {D. E.} and Jen, {K. L.} and Ji, {X. L.} and Ji, {X. P.} and Johnson, {R. A.} and D. Jones and L. Kang and Kettell, {S. H.} and Koerner, {L. W.} and S. Kohn and M. Kramer and Langford, {T. J.} and Lee, {J. H.C.} and Lei, {R. T.} and R. Leitner and Leung, {J. K.C.} and C. Li and F. Li and Li, {H. L.} and Li, {Q. J.} and S. Li and Li, {S. C.} and Li, {S. J.} and Li, {W. D.} and Li, {X. N.} and Li, {X. Q.} and Li, {Y. F.} and Li, {Z. B.} and H. Liang and Lin, {C. J.} and Lin, {G. L.} and S. Lin and Ling, {J. J.} and Link, {J. M.} and L. Littenberg and Littlejohn, {B. R.} and Liu, {J. C.} and Liu, {J. L.} and Y. Liu and Liu, {Y. H.} and C. Lu and Lu, {H. Q.} and Lu, {J. S.} and Luk, {K. B.} and Ma, {X. B.} and Ma, {X. Y.} and Ma, {Y. Q.} and C. Marshall and {Martinez Caicedo}, {D. A.} and McDonald, {K. T.} and McKeown, {R. D.} and I. Mitchell and {Mora Lepin}, L. and J. Napolitano and D. Naumov and E. Naumova and Ochoa-Ricoux, {J. P.} and A. Olshevskiy and Pan, {H. R.} and J. Park and S. Patton and V. Pec and Peng, {J. C.} and L. Pinsky and Pun, {C. S.J.} and Qi, {F. Z.} and M. Qi and X. Qian and N. Raper and J. Ren and R. Rosero and B. Roskovec and Ruan, {X. C.} and H. Steiner and Sun, {J. L.} and K. Treskov and Tse, {W. H.} and Tull, {C. E.} and B. Viren and V. Vorobel and Wang, {C. H.} and J. Wang and M. Wang and Wang, {N. Y.} and Wang, {R. G.} and W. Wang and W. Wang and X. Wang and Y. Wang and Wang, {Y. F.} and Z. Wang and Z. Wang and Wang, {Z. M.} and Wei, {H. Y.} and Wei, {L. H.} and Wen, {L. J.} and K. Whisnant and White, {C. G.} and Wong, {H. L.H.} and Wong, {S. C.F.} and E. Worcester and Q. Wu and Wu, {W. J.} and Xia, {D. M.} and Xing, {Z. Z.} and Xu, {J. L.} and T. Xue and Yang, {C. G.} and L. Yang and Yang, {M. S.} and Yang, {Y. Z.} and M. Ye and M. Yeh and Young, {B. L.} and Yu, {H. Z.} and Yu, {Z. Y.} and Yue, {B. B.} and S. Zeng and Y. Zeng and L. Zhan and C. Zhang and Zhang, {C. C.} and Zhang, {F. Y.} and Zhang, {H. H.} and Zhang, {J. W.} and Zhang, {Q. M.} and R. Zhang and Zhang, {X. F.} and Zhang, {X. T.} and Zhang, {Y. M.} and Zhang, {Y. M.} and Zhang, {Y. X.} and Zhang, {Y. Y.} and Zhang, {Z. J.} and Zhang, {Z. P.} and Zhang, {Z. Y.} and J. Zhao and L. Zhou and Zhuang, {H. L.} and Zou, {J. H.}",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",

year = "2019",

month = sep,

day = "13",

doi = "10.1103/PhysRevLett.123.111801",

language = "???core.languages.en_GB???",

volume = "123",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "11",

}

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, 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, HR, 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, WH, 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 2019, 'Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay', Physical Review Letters, vol. 123, no. 11, 111801. https://doi.org/10.1103/PhysRevLett.123.111801

TY - JOUR

T1 - Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay

AU - Adey, D.

AU - An, F. P.

AU - Balantekin, A. B.

AU - Band, H. R.

AU - Bishai, M.

AU - Blyth, S.

AU - Cao, D.

AU - Cao, G. F.

AU - Cao, J.

AU - Chang, J. F.

AU - Chang, Y.

AU - Chen, H. S.

AU - Chen, S. M.

AU - Chen, Y.

AU - Chen, Y. X.

AU - Cheng, J.

AU - Cheng, Z. K.

AU - Cherwinka, J. J.

AU - Chu, M. C.

AU - Chukanov, A.

AU - Cummings, J. P.

AU - Dash, N.

AU - Deng, F. S.

AU - Ding, Y. Y.

AU - Diwan, M. V.

AU - Dohnal, T.

AU - Dove, J.

AU - Dvořák, M.

AU - Dwyer, D. A.

AU - Gonchar, M.

AU - Gong, G. H.

AU - Gong, H.

AU - Gu, W. Q.

AU - Guo, J. Y.

AU - Guo, L.

AU - Guo, X. H.

AU - Guo, Y. H.

AU - Guo, Z.

AU - Hackenburg, R. W.

AU - Hans, S.

AU - He, M.

AU - Heeger, K. M.

AU - Heng, Y. K.

AU - Higuera, A.

AU - Hor, Y. K.

AU - Hsiung, Y. B.

AU - Hu, B. Z.

AU - Hu, J. R.

AU - Hu, T.

AU - Hu, Z. J.

AU - Huang, H. X.

AU - Huang, X. T.

AU - Huang, Y. B.

AU - Huber, P.

AU - Jaffe, D. E.

AU - Jen, K. L.

AU - Ji, X. L.

AU - Ji, X. P.

AU - Johnson, R. A.

AU - Jones, D.

AU - Kang, L.

AU - Kettell, S. H.

AU - Koerner, L. W.

AU - Kohn, S.

AU - Kramer, M.

AU - Langford, T. J.

AU - Lee, J. H.C.

AU - Lei, R. T.

AU - Leitner, R.

AU - Leung, J. K.C.

AU - Li, C.

AU - Li, F.

AU - Li, H. L.

AU - Li, Q. J.

AU - Li, S.

AU - Li, S. C.

AU - Li, S. J.

AU - Li, W. D.

AU - Li, X. N.

AU - Li, X. Q.

AU - Li, Y. F.

AU - Li, Z. B.

AU - Liang, H.

AU - Lin, C. J.

AU - Lin, G. L.

AU - Lin, S.

AU - Ling, J. J.

AU - Link, J. M.

AU - Littenberg, L.

AU - Littlejohn, B. R.

AU - Liu, J. C.

AU - Liu, J. L.

AU - Liu, Y.

AU - Liu, Y. H.

AU - Lu, C.

AU - Lu, H. Q.

AU - Lu, J. S.

AU - Luk, K. B.

AU - Ma, X. B.

AU - Ma, X. Y.

AU - Ma, Y. Q.

AU - Marshall, C.

AU - Martinez Caicedo, D. A.

AU - McDonald, K. T.

AU - McKeown, R. D.

AU - Mitchell, I.

AU - Mora Lepin, L.

AU - Napolitano, J.

AU - Naumov, D.

AU - Naumova, E.

AU - Ochoa-Ricoux, J. P.

AU - Olshevskiy, A.

AU - Pan, H. R.

AU - Park, J.

AU - Patton, S.

AU - Pec, V.

AU - Peng, J. C.

AU - Pinsky, L.

AU - Pun, C. S.J.

AU - Qi, F. Z.

AU - Qi, M.

AU - Qian, X.

AU - Raper, N.

AU - Ren, J.

AU - Rosero, R.

AU - Roskovec, B.

AU - Ruan, X. C.

AU - Steiner, H.

AU - Sun, J. L.

AU - Treskov, K.

AU - Tse, W. H.

AU - Tull, C. E.

AU - Viren, B.

AU - Vorobel, V.

AU - Wang, C. H.

AU - Wang, J.

AU - Wang, M.

AU - Wang, N. Y.

AU - Wang, R. G.

AU - Wang, W.

AU - Wang, X.

AU - Wang, Y.

AU - Wang, Y. F.

AU - Wang, Z.

AU - Wang, Z. M.

AU - Wei, H. Y.

AU - Wei, L. H.

AU - Wen, L. J.

AU - Whisnant, K.

AU - White, C. G.

AU - Wong, H. L.H.

AU - Wong, S. C.F.

AU - Worcester, E.

AU - Wu, Q.

AU - Wu, W. J.

AU - Xia, D. M.

AU - Xing, Z. Z.

AU - Xu, J. L.

AU - Xue, T.

AU - Yang, C. G.

AU - Yang, L.

AU - Yang, M. S.

AU - Yang, Y. Z.

AU - Ye, M.

AU - Yeh, M.

AU - Young, B. L.

AU - Yu, H. Z.

AU - Yu, Z. Y.

AU - Yue, B. B.

AU - Zeng, S.

AU - Zeng, Y.

AU - Zhan, L.

AU - Zhang, C.

AU - Zhang, C. C.

AU - Zhang, F. Y.

AU - Zhang, H. H.

AU - Zhang, J. W.

AU - Zhang, Q. M.

AU - Zhang, R.

AU - Zhang, X. F.

AU - Zhang, X. T.

AU - Zhang, Y. M.

AU - Zhang, Y. X.

AU - Zhang, Y. Y.

AU - Zhang, Z. J.

AU - Zhang, Z. P.

AU - Zhang, Z. Y.

AU - Zhao, J.

AU - Zhou, L.

AU - Zhuang, H. L.

AU - Zou, J. H.

PY - 2019/9/13

Y1 - 2019/9/13

N2 - This Letter reports the first extraction of individual antineutrino spectra from U235 and Pu239 fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5×106 inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, U235 and Pu239, 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 U235 (Pu239) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for U235 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.

AB - This Letter reports the first extraction of individual antineutrino spectra from U235 and Pu239 fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5×106 inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, U235 and Pu239, 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 U235 (Pu239) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for U235 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.

UR - http://www.scopus.com/inward/record.url?scp=85072725829&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.123.111801

DO - 10.1103/PhysRevLett.123.111801

M3 - 期刊論文

C2 - 31573238

AN - SCOPUS:85072725829

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 111801

ER -

Extraction of the U 235 and Pu 239 antineutrino spectra at Daya Bay

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