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

D Adey¹, F P An², A B Balantekin³, H R Band⁴, M Bishai⁵, S Blyth⁶, D Cao⁷, G F Cao¹, J Cao¹, J F Chang¹, Y Chang⁸, H S Chen¹, S M Chen⁹, Y Chen^{10

11}, Y X Chen¹², J Cheng¹, Z K Cheng¹¹, J J Cherwinka³, M C Chu¹³, A Chukanov¹⁴, J P Cummings¹⁵, N Dash¹, F S Deng¹⁶, Y Y Ding¹, M V Diwan⁵, T Dohnal¹⁷, J Dove¹⁸, M Dvořák¹⁷, D A Dwyer¹⁹, M Gonchar¹⁴, G H Gong⁹, H Gong⁹, W Q Gu⁵, J Y Guo¹¹, L Guo⁹, X H Guo²⁰, Y H Guo²¹, Z Guo⁹, R W Hackenburg⁵, S Hans⁵, M He¹, K M Heeger⁴, Y K Heng¹, A Higuera²², Y K Hor¹¹, Y B Hsiung⁶, B Z Hu⁶, J R Hu¹, T Hu¹, Z J Hu¹¹, H X Huang²³, X T Huang²⁴, Y B Huang¹, P Huber²⁵, D E Jaffe⁵, K L Jen²⁶, X L Ji¹, X P Ji⁵, R A Johnson²⁷, D Jones²⁸, L Kang²⁹, S H Kettell⁵, L W Koerner²², S Kohn³⁰, M Kramer^{19

30}, T J Langford⁴, J Lee¹⁹, J H C Lee³¹, R T Lei²⁹, R Leitner¹⁷, J K C Leung³¹, C Li²⁴, F Li¹, H L Li¹, Q J Li¹, S Li²⁹, S C Li²⁵, S J Li¹¹, W D Li¹, X N Li¹, X Q Li³², Y F Li¹, Z B Li¹¹, H Liang¹⁶, C J Lin¹⁹, G L Lin²⁶, S Lin²⁹, J J Ling¹¹, J M Link²⁵, L Littenberg⁵, B R Littlejohn³³, J C Liu¹, J L Liu³⁴, Y Liu²⁴, Y H Liu⁷, C Lu³⁵, H Q Lu¹, J S Lu¹, K B Luk^{19

30}, X B Ma¹², X Y Ma¹, Y Q Ma¹, C Marshall¹⁹, D A Martinez Caicedo³³, K T McDonald³⁵, R D McKeown^{36

37}, I Mitchell²², L Mora Lepin³⁸, J Napolitano²⁸, D Naumov¹⁴, E Naumova¹⁴, J P Ochoa-Ricoux^{38

39}, A Olshevskiy¹⁴, H-R Pan⁶, J Park²⁵, S Patton¹⁹, V Pec¹⁷, J C Peng¹⁸, L Pinsky²², C S J Pun³¹, F Z Qi¹, M Qi⁷, X Qian⁵, N Raper¹¹, J Ren²³, R Rosero⁵, B Roskovec³⁹, X C Ruan²³, H Steiner^{19

30}, J L Sun⁴⁰, K Treskov¹⁴, W-H Tse¹³, C E Tull¹⁹, B Viren⁵, V Vorobel¹⁷, C H Wang⁸, J Wang¹¹, M Wang²⁴, N Y Wang²⁰, R G Wang¹, W Wang^{11

37}, W Wang⁷, X Wang⁴¹, Y Wang⁷, Y F Wang¹, Z Wang¹, Z Wang⁹, Z M Wang¹, H Y Wei⁵, L H Wei¹, L J Wen¹, K Whisnant⁴², C G White³³, H L H Wong^{19

30}, S C F Wong¹¹, E Worcester⁵, Q Wu²⁴, W J Wu¹, D M Xia⁴³, Z Z Xing¹, J L Xu¹, T Xue⁹, C G Yang¹, L Yang²⁹, M S Yang¹, Y Z Yang⁹, M Ye¹, M Yeh⁵, B L Young⁴², H Z Yu¹¹, Z Y Yu¹, B B Yue¹¹, S Zeng¹, Y Zeng¹¹, L Zhan¹, C Zhang⁵, C C Zhang¹, F Y Zhang³⁴, H H Zhang¹¹, J W Zhang¹, Q M Zhang²¹, R Zhang⁷, X F Zhang¹, X T Zhang¹, Y M Zhang¹¹, Y M Zhang⁹, Y X Zhang⁴⁰, Y Y Zhang³⁴, Z J Zhang²⁹, Z P Zhang¹⁶, Z Y Zhang¹, J Zhao¹, L Zhou¹, H L Zhuang¹, J H Zou¹; Daya Bay Collaboration

Affiliations

¹ Institute of High Energy Physics, Beijing.
² Institute of Modern Physics, East China University of Science and Technology, Shanghai.
³ University of Wisconsin, Madison, Wisconsin 53706.
⁴ Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520.
⁵ Brookhaven National Laboratory, Upton, New York 11973.
⁶ Department of Physics, National Taiwan University, Taipei.
⁷ Nanjing University, Nanjing.
⁸ National United University, Miao-Li.
⁹ Department of Engineering Physics, Tsinghua University, Beijing.
¹⁰ Shenzhen University, Shenzhen.
¹¹ Sun Yat-Sen (Zhongshan) University, Guangzhou.
¹² North China Electric Power University, Beijing.
¹³ Chinese University of Hong Kong, Hong Kong.
¹⁴ Joint Institute for Nuclear Research, Dubna, Moscow Region.
¹⁵ Siena College, Loudonville, New York 12211.
¹⁶ University of Science and Technology of China, Hefei.
¹⁷ Charles University, Faculty of Mathematics and Physics, Prague.
¹⁸ Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801.
¹⁹ Lawrence Berkeley National Laboratory, Berkeley, California 94720.
²⁰ Beijing Normal University, Beijing.
²¹ Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an.
²² Department of Physics, University of Houston, Houston, Texas 77204.
²³ China Institute of Atomic Energy, Beijing.
²⁴ Shandong University, Jinan.
²⁵ Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061.
²⁶ Institute of Physics, National Chiao-Tung University, Hsinchu.
²⁷ Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221.
²⁸ Department of Physics, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122.
²⁹ Dongguan University of Technology, Dongguan.
³⁰ Department of Physics, University of California, Berkeley, California 94720.
³¹ Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
³² School of Physics, Nankai University, Tianjin.
³³ Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616.
³⁴ Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai.
³⁵ Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544.
³⁶ California Institute of Technology, Pasadena, California 91125.
³⁷ College of William and Mary, Williamsburg, Virginia 23187.
³⁸ Instituto de Física, Pontificia Universidad Católica de Chile, Santiago.
³⁹ Department of Physics and Astronomy, University of California, Irvine, California 92697.
⁴⁰ China General Nuclear Power Group, Shenzhen.
⁴¹ College of Electronic Science and Engineering, National University of Defense Technology, Changsha.
⁴² Iowa State University, Ames, Iowa 50011.
⁴³ Chongqing University, Chongqing.

PMID: 31573238
DOI: 10.1103/PhysRevLett.123.111801

Free article

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

D Adey et al. Phys Rev Lett. 2019.

Free article

. 2019 Sep 13;123(11):111801.

doi: 10.1103/PhysRevLett.123.111801.

Authors

Affiliations

¹ Institute of High Energy Physics, Beijing.
² Institute of Modern Physics, East China University of Science and Technology, Shanghai.
³ University of Wisconsin, Madison, Wisconsin 53706.
⁴ Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520.
⁵ Brookhaven National Laboratory, Upton, New York 11973.
⁶ Department of Physics, National Taiwan University, Taipei.
⁷ Nanjing University, Nanjing.
⁸ National United University, Miao-Li.
⁹ Department of Engineering Physics, Tsinghua University, Beijing.
¹⁰ Shenzhen University, Shenzhen.
¹¹ Sun Yat-Sen (Zhongshan) University, Guangzhou.
¹² North China Electric Power University, Beijing.
¹³ Chinese University of Hong Kong, Hong Kong.
¹⁴ Joint Institute for Nuclear Research, Dubna, Moscow Region.
¹⁵ Siena College, Loudonville, New York 12211.
¹⁶ University of Science and Technology of China, Hefei.
¹⁷ Charles University, Faculty of Mathematics and Physics, Prague.
¹⁸ Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801.
¹⁹ Lawrence Berkeley National Laboratory, Berkeley, California 94720.
²⁰ Beijing Normal University, Beijing.
²¹ Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an.
²² Department of Physics, University of Houston, Houston, Texas 77204.
²³ China Institute of Atomic Energy, Beijing.
²⁴ Shandong University, Jinan.
²⁵ Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061.
²⁶ Institute of Physics, National Chiao-Tung University, Hsinchu.
²⁷ Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221.
²⁸ Department of Physics, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122.
²⁹ Dongguan University of Technology, Dongguan.
³⁰ Department of Physics, University of California, Berkeley, California 94720.
³¹ Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
³² School of Physics, Nankai University, Tianjin.
³³ Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616.
³⁴ Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai.
³⁵ Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544.
³⁶ California Institute of Technology, Pasadena, California 91125.
³⁷ College of William and Mary, Williamsburg, Virginia 23187.
³⁸ Instituto de Física, Pontificia Universidad Católica de Chile, Santiago.
³⁹ Department of Physics and Astronomy, University of California, Irvine, California 92697.
⁴⁰ China General Nuclear Power Group, Shenzhen.
⁴¹ College of Electronic Science and Engineering, National University of Defense Technology, Changsha.
⁴² Iowa State University, Ames, Iowa 50011.
⁴³ Chongqing University, Chongqing.

PMID: 31573238
DOI: 10.1103/PhysRevLett.123.111801

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

Affiliations

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

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources