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Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

Reactor neutrino experiments play a crucial role in advancing our knowledge of neutrinos. In this Letter, the evolution of the flux and spectrum as a function of the reactor isotopic content is reported in terms of the inverse-beta-decay yield at Daya Bay with 1958 days of data and improved systemat...

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Published in:Physical review letters 2023-05, Vol.130 (21), p.211801-211801, Article 211801
Main Authors: Cao, G F, Chen, Y, Chen, Y X, Cheng, J, Cummings, J P, Dalager, O, Deng, F S, Ding, Y Y, Diwan, M V, Dolzhikov, D, Dove, J, Dwyer, D A, Gallo, J P, Gonchar, M, Gu, W Q, Guo, J Y, Guo, L, Guo, Y H, Hackenburg, R W, Han, Y, He, M, Hu, B Z, Hu, J R, Hu, Z J, Huang, Y B, Huber, P, Jaffe, D E, Jen, K L, Ji, X L, Jones, D, Langford, T J, Lee, J H C, Li, H L, Li, Q J, Li, S C, Li, W D, Li, X Q, Li, Z B, Lin, G L, Lin, S, Littenberg, L, Liu, J C, Liu, J L, Lu, C, Ma, X B, Ma, X Y, Mandujano, R C, Marshall, C, McDonald, K T, McKeown, R D, Meng, Y, Napolitano, J, Naumova, E, Nguyen, T M T, Patton, S, Peng, J C, Qi, M, Qian, X, Raper, N, Ren, J, Morales Reveco, C, Ruan, X C, Russell, B, Sun, J L, Treskov, K, Tse, W-H, Tull, C E, Tung, Y C, Viren, B, Vorobel, V, Wang, C H, Wang, J, Wang, M, Wang, N Y, Wang, Y, Wei, H Y, Wen, L J, Whisnant, K, Wong, H L H, Wu, Q, Xie, Z Q, Xu, J L, Yang, L, Yao, H F, Ye, M, Young, B L, Yu, H Z, Yu, Z Y, Yue, B B, Zavadskyi, V, Zeng, S, Zeng, Y, Zhang, C, Zhang, H H, Zhang, J W, Zhang, S Q, Zhang, Y M, Zhang, Z J, Zhou, L, Zou, J H
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Language:English
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Summary:Reactor neutrino experiments play a crucial role in advancing our knowledge of neutrinos. In this Letter, the evolution of the flux and spectrum as a function of the reactor isotopic content is reported in terms of the inverse-beta-decay yield at Daya Bay with 1958 days of data and improved systematic uncertainties. These measurements are compared with two signature model predictions: the Huber-Mueller model based on the conversion method and the SM2018 model based on the summation method. The measured average flux and spectrum, as well as the flux evolution with the ^{239}Pu isotopic fraction, are inconsistent with the predictions of the Huber-Mueller model. In contrast, the SM2018 model is shown to agree with the average flux and its evolution but fails to describe the energy spectrum. Altering the predicted inverse-beta-decay spectrum from ^{239}Pu fission does not improve the agreement with the measurement for either model. The models can be brought into better agreement with the measurements if either the predicted spectrum due to ^{235}U fission is changed or the predicted ^{235}U, ^{238}U, ^{239}Pu, and ^{241}Pu spectra are changed in equal measure.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.130.211801