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  1. Article ; Online: Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay.

    An, F P / Bai, W D / Balantekin, A B / Bishai, M / Blyth, S / Cao, G F / Cao, J / Chang, J F / Chang, Y / Chen, H S / Chen, H Y / Chen, S M / Chen, Y / Chen, Y X / Cheng, J / Cheng, Y-C / Cheng, Z K / Cherwinka, J J / Chu, M C /
    Cummings, J P / Dalager, O / Deng, F S / Ding, Y Y / Diwan, M V / Dohnal, T / Dolzhikov, D / Dove, J / Dugas, K V / Duyang, H Y / Dwyer, D A / Gallo, J P / Gonchar, M / Gong, G H / Gong, H / Gu, W Q / Guo, J Y / Guo, L / Guo, X H / Guo, Y H / Guo, Z / Hackenburg, R W / Han, Y / Hans, S / He, M / Heeger, K M / Heng, Y K / Hor, Y K / Hsiung, Y B / Hu, B Z / Hu, J R / Hu, T / Hu, Z J / Huang, H X / Huang, J H / Huang, X T / Huang, Y B / Huber, P / Jaffe, D E / Jen, K L / Ji, X L / Ji, X P / Johnson, R A / Jones, D / Kang, L / Kettell, S H / Kohn, S / Kramer, M / Langford, T J / Lee, J / Lee, J H C / Lei, R T / Leitner, R / Leung, J K C / Li, F / Li, H L / Li, J J / Li, Q J / Li, R H / Li, S / Li, S C / Li, W D / Li, X N / Li, X Q / Li, Y F / Li, Z B / Liang, H / Lin, C J / Lin, G L / Lin, S / Ling, J J / Link, J M / Littenberg, L / Littlejohn, B R / Liu, J C / Liu, J L / Liu, J X / Lu, C / Lu, H Q / Luk, K B / Ma, B Z / Ma, X B / Ma, X Y / Ma, Y Q / Mandujano, R C / Marshall, C / McDonald, K T / McKeown, R D / Meng, Y / Napolitano, J / Naumov, D / Naumova, E / Nguyen, T M T / Ochoa-Ricoux, J P / Olshevskiy, A / Park, J / Patton, S / Peng, J C / Pun, C S J / Qi, F Z / Qi, M / Qian, X / Raper, N / Ren, J / Morales Reveco, C / Rosero, R / Roskovec, B / Ruan, X C / Russell, B / Steiner, H / Sun, J L / Tmej, T / 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, R G / Wang, W / Wang, X / Wang, Y / Wang, Y F / Wang, Z / Wang, Z M / Wei, H Y / Wei, L H / Wen, L J / Whisnant, K / White, C G / Wong, H L H / Worcester, E / Wu, D R / Wu, Q / Wu, W J / Xia, D M / Xie, Z Q / Xing, Z Z / Xu, H K / Xu, J L / Xu, T / Xue, T / Yang, C G / Yang, L / Yang, Y Z / Yao, H F / Ye, M / Yeh, M / Young, B L / Yu, H Z / Yu, Z Y / Yue, B B / Zavadskyi, V / Zeng, S / Zeng, Y / Zhan, L / Zhang, C / Zhang, F Y / Zhang, H H / Zhang, J L / Zhang, J W / Zhang, Q M / Zhang, S Q / Zhang, X T / Zhang, Y M / Zhang, Y X / Zhang, Y Y / Zhang, Z J / Zhang, Z P / Zhang, Z Y / Zhao, J / Zhao, R Z / Zhou, L / Zhuang, H L / Zou, J H

    Physical review letters

    2023  Volume 130, Issue 21, Page(s) 211801

    Abstract: 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 ... ...

    Abstract 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.
    MeSH term(s) Nuclear Reactors ; Uranium
    Chemical Substances Plutonium-239 (ET2Z8EJJ1X) ; Uranium (4OC371KSTK)
    Language English
    Publishing date 2023-05-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.211801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Precision Measurement of Reactor Antineutrino Oscillation at Kilometer-Scale Baselines by Daya Bay.

    An, F P / Bai, W D / Balantekin, A B / Bishai, M / Blyth, S / Cao, G F / Cao, J / Chang, J F / Chang, Y / Chen, H S / Chen, H Y / Chen, S M / Chen, Y / Chen, Y X / Chen, Z Y / Cheng, J / Cheng, Z K / Cherwinka, J J / Chu, M C /
    Cummings, J P / Dalager, O / Deng, F S / Ding, Y Y / Ding, X Y / Diwan, M V / Dohnal, T / Dolzhikov, D / Dove, J / Duyang, H Y / Dwyer, D A / Gallo, J P / Gonchar, M / Gong, G H / Gong, H / Gu, W Q / Guo, J Y / Guo, L / Guo, X H / Guo, Y H / Guo, Z / Hackenburg, R W / Han, Y / Hans, S / He, M / Heeger, K M / Heng, Y K / Hor, Y K / Hsiung, Y B / Hu, B Z / Hu, J R / Hu, T / Hu, Z J / Huang, H X / Huang, J H / Huang, X T / Huang, Y B / Huber, P / Jaffe, D E / Jen, K L / Ji, X L / Ji, X P / Johnson, R A / Jones, D / Kang, L / Kettell, S H / Kohn, S / Kramer, M / Langford, T J / Lee, J / Lee, J H C / Lei, R T / Leitner, R / Leung, J K C / Li, F / Li, H L / Li, J J / Li, Q J / Li, R H / Li, S / Li, S C / Li, W D / Li, X N / Li, X Q / Li, Y F / Li, Z B / Liang, H / Lin, C J / Lin, G L / Lin, S / Ling, J J / Link, J M / Littenberg, L / Littlejohn, B R / Liu, J C / Liu, J L / Liu, J X / Lu, C / Lu, H Q / Luk, K B / Ma, B Z / Ma, X B / Ma, X Y / Ma, Y Q / Mandujano, R C / Marshall, C / McDonald, K T / McKeown, R D / Meng, Y / Napolitano, J / Naumov, D / Naumova, E / Nguyen, T M T / Ochoa-Ricoux, J P / Olshevskiy, A / Pan, H-R / Park, J / Patton, S / Peng, J C / Pun, C S J / Qi, F Z / Qi, M / Qian, X / Raper, N / Ren, J / Morales Reveco, C / Rosero, R / Roskovec, B / Ruan, X C / Russell, B / Steiner, H / Sun, J L / Tmej, T / Treskov, K / Tse, W-H / Tull, C E / Viren, B / Vorobel, V / Wang, C H / Wang, J / Wang, M / Wang, N Y / Wang, R G / Wang, W / Wang, X / Wang, Y / Wang, Y F / Wang, Z / Wang, Z M / Wei, H Y / Wei, L H / Wei, W / Wen, L J / Whisnant, K / White, C G / Wong, H L H / Worcester, E / Wu, D R / Wu, Q / Wu, W J / Xia, D M / Xie, Z Q / Xing, Z Z / Xu, H K / Xu, J L / Xu, T / Xue, T / Yang, C G / Yang, L / Yang, Y Z / Yao, H F / Ye, M / Yeh, M / Young, B L / Yu, H Z / Yu, Z Y / Yue, B B / Zavadskyi, V / Zeng, S / Zeng, Y / Zhan, L / Zhang, C / Zhang, F Y / Zhang, H H / Zhang, J L / Zhang, J W / Zhang, Q M / Zhang, S Q / Zhang, X T / Zhang, Y M / Zhang, Y X / Zhang, Y Y / Zhang, Z J / Zhang, Z P / Zhang, Z Y / Zhao, J / Zhao, R Z / Zhou, L / Zhuang, H L / Zou, J H

    Physical review letters

    2023  Volume 130, Issue 16, Page(s) 161802

    Abstract: We present a new determination of the smallest neutrino mixing angle θ_{13} and the mass-squared difference Δm_{32}^{2} using a final sample of 5.55×10^{6} inverse beta-decay (IBD) candidates with the final-state neutron captured on gadolinium. This ... ...

    Abstract We present a new determination of the smallest neutrino mixing angle θ_{13} and the mass-squared difference Δm_{32}^{2} using a final sample of 5.55×10^{6} inverse beta-decay (IBD) candidates with the final-state neutron captured on gadolinium. This sample is selected from the complete dataset obtained by the Daya Bay reactor neutrino experiment in 3158 days of operation. Compared to the previous Daya Bay results, selection of IBD candidates has been optimized, energy calibration refined, and treatment of backgrounds further improved. The resulting oscillation parameters are sin^{2}2θ_{13}=0.0851±0.0024, Δm_{32}^{2}=(2.466±0.060)×10^{-3}  eV^{2} for the normal mass ordering or Δm_{32}^{2}=-(2.571±0.060)×10^{-3}  eV^{2} for the inverted mass ordering.
    Language English
    Publishing date 2023-05-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.161802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: First Measurement of High-Energy Reactor Antineutrinos at Daya Bay.

    An, F P / Bai, W D / Balantekin, A B / Bishai, M / Blyth, S / Cao, G F / Cao, J / Chang, J F / Chang, Y / Chen, H S / Chen, H Y / Chen, S M / Chen, Y / Chen, Y X / Cheng, J / Cheng, Z K / Cherwinka, J J / Chu, M C / Cummings, J P /
    Dalager, O / Deng, F S / Ding, Y Y / Diwan, M V / Dohnal, T / Dolzhikov, D / Dove, J / Dwyer, D A / Gallo, J P / Gonchar, M / Gong, G H / Gong, H / Gu, W Q / Guo, J Y / Guo, L / Guo, X H / Guo, Y H / Guo, Z / Hackenburg, R W / Hans, S / He, M / Heeger, K M / Heng, Y K / Hor, Y K / Hsiung, Y B / Hu, B Z / Hu, J R / Hu, T / Hu, Z J / Huang, H X / Huang, J H / Huang, X T / Huang, Y B / Huber, P / Jaffe, D E / Jen, K L / Ji, X L / Ji, X P / Johnson, R A / Jones, D / Kang, L / Kettell, S H / Kohn, S / Kramer, M / Langford, T J / Lee, J / Lee, J H C / Lei, R T / Leitner, R / Leung, J K C / Li, F / Li, H L / Li, J J / Li, Q J / Li, R H / Li, S / Li, S C / Li, W D / Li, X N / Li, X Q / Li, Y F / Li, Z B / Liang, H / Lin, C J / Lin, G L / Lin, S / Ling, J J / Link, J M / Littenberg, L / Littlejohn, B R / Liu, J C / Liu, J L / Liu, J X / Lu, C / Lu, H Q / Luk, K B / Ma, B Z / Ma, X B / Ma, X Y / Ma, Y Q / Mandujano, R C / Marshall, C / McDonald, K T / McKeown, R D / Meng, Y / Napolitano, J / Naumov, D / Naumova, E / Nguyen, T M T / Ochoa-Ricoux, J P / Olshevskiy, A / Pan, H-R / Park, J / Patton, S / Peng, J C / Pun, C S J / Qi, F Z / Qi, M / Qian, X / Raper, N / Ren, J / Morales Reveco, C / Rosero, R / Roskovec, B / Ruan, X C / Steiner, H / Sun, J L / Tmej, T / Treskov, K / Tse, W-H / Tull, C E / Viren, B / Vorobel, V / Wang, C H / Wang, J / Wang, M / Wang, N Y / Wang, R G / Wang, W / Wang, X / Wang, Y / Wang, Y F / Wang, Z / Wang, Z M / Wei, H Y / Wei, L H / Wen, L J / Whisnant, K / White, C G / Wong, H L H / Worcester, E / Wu, D R / Wu, Q / Wu, W J / Xia, D M / Xie, Z Q / Xing, Z Z / Xu, H K / Xu, J L / Xu, T / Xue, T / Yang, C G / Yang, L / Yang, Y Z / Yao, H F / Ye, M / Yeh, M / Young, B L / Yu, H Z / Yu, Z Y / Yue, B B / Zavadskyi, V / Zeng, S / Zeng, Y / Zhan, L / Zhang, C / Zhang, F Y / Zhang, H H / Zhang, J L / Zhang, J W / Zhang, Q M / Zhang, S Q / Zhang, X T / Zhang, Y M / Zhang, Y X / Zhang, Y Y / Zhang, Z J / Zhang, Z P / Zhang, Z Y / Zhao, J / Zhao, R Z / Zhou, L / Zhuang, H L / Zou, J H

    Physical review letters

    2022  Volume 129, Issue 4, Page(s) 41801

    Abstract: This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used ...

    Abstract This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8-11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Q_{β} isotopes in commercial reactors.
    Language English
    Publishing date 2022-08-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.041801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Joint Determination of Reactor Antineutrino Spectra from ^{235}U and ^{239}Pu Fission by Daya Bay and PROSPECT.

    An, F P / Andriamirado, M / Balantekin, A B / Band, H R / Bass, C D / Bergeron, D E / Berish, D / Bishai, M / Blyth, S / Bowden, N S / Bryan, C 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 / Classen, T / Conant, A J / Cummings, J P / Dalager, O / Deichert, G / Delgado, A / Deng, F S / Ding, Y Y / Diwan, M V / Dohnal, T / Dolinski, M J / Dolzhikov, D / Dove, J / Dvořák, M / Dwyer, D A / Erickson, A / Foust, B T / Gaison, J K / Galindo-Uribarri, A / Gallo, J P / Gilbert, C E / Gonchar, M / Gong, G H / Gong, H / Grassi, M / Gu, W Q / Guo, J Y / Guo, L / Guo, X H / Guo, Y H / Guo, Z / Hackenburg, R W / Hans, S / Hansell, A B / He, M / Heeger, K M / Heffron, B / Heng, Y K / Hor, Y K / Hsiung, Y B / Hu, B Z / Hu, J R / Hu, T / Hu, Z J / Huang, H X / Huang, J H / Huang, X T / Huang, Y B / Huber, P / Koblanski, J / Jaffe, D E / Jayakumar, S / Jen, K L / Ji, X L / Ji, X P / Johnson, R A / Jones, D C / Kang, L / Kettell, S H / Kohn, S / Kramer, M / Kyzylova, O / Lane, C E / Langford, T J / LaRosa, J / Lee, J / Lee, J H C / Lei, R T / Leitner, R / Leung, J K C / Li, F / Li, H L / Li, J J / Li, Q J / Li, R H / Li, S / Li, S C / Li, W D / Li, X N / Li, X Q / Li, Y F / Li, Z B / Liang, H / Lin, C J / Lin, G L / Lin, S / Ling, J J / Link, J M / Littenberg, L / Littlejohn, B R / Liu, J C / Liu, J L / Liu, J X / Lu, C / Lu, H Q / Lu, X / Luk, K B / Ma, B Z / Ma, X B / Ma, X Y / Ma, Y Q / Mandujano, R C / Maricic, J / Marshall, C / McDonald, K T / McKeown, R D / Mendenhall, M P / Meng, Y / Meyer, A M / Milincic, R / Mueller, P E / Mumm, H P / Napolitano, J / Naumov, D / Naumova, E / Neilson, R / Nguyen, T M T / Nikkel, J A / Nour, S / Ochoa-Ricoux, J P / Olshevskiy, A / Palomino, J L / Pan, H-R / Park, J / Patton, S / Peng, J C / Pun, C S J / Pushin, D A / Qi, F Z / Qi, M / Qian, X / Raper, N / Ren, J / Morales Reveco, C / Rosero, R / Roskovec, B / Ruan, X C / Searles, M / Steiner, H / Sun, J L / Surukuchi, P T / Tmej, T / Treskov, K / Tse, W-H / Tull, C E / Tyra, M A / Varner, R L / Venegas-Vargas, D / Viren, B / Vorobel, V / Wang, C H / Wang, J / Wang, M / Wang, N Y / Wang, R G / Wang, W / Wang, X / Wang, Y / Wang, Y F / Wang, Z / Wang, Z M / Weatherly, P B / Wei, H Y / Wei, L H / Wen, L J / Whisnant, K / White, C / Wilhelmi, J / Wong, H L H / Woolverton, A / Worcester, E / Wu, D R / Wu, F L / Wu, Q / Wu, W J / Xia, D M / Xie, Z Q / Xing, Z Z / Xu, H K / Xu, J L / Xu, T / Xue, T / Yang, C G / Yang, L / Yang, Y Z / Yao, H F / Ye, M / Yeh, M / Young, B L / Yu, H Z / Yu, Z Y / Yue, B B / Zavadskyi, V / Zeng, S / Zeng, Y / Zhan, L / Zhang, C / Zhang, F Y / Zhang, H H / Zhang, J W / Zhang, Q M / Zhang, S Q / Zhang, X / Zhang, X T / Zhang, Y M / Zhang, Y X / Zhang, Y Y / Zhang, Z J / Zhang, Z P / Zhang, Z Y / Zhao, J / Zhao, R Z / Zhou, L / Zhuang, H L / Zou, J H

    Physical review letters

    2022  Volume 128, Issue 8, Page(s) 81801

    Abstract: A joint determination of the reactor antineutrino spectra resulting from the fission of ^{235}U and ^{239}Pu has been carried out by the Daya Bay and PROSPECT Collaborations. This Letter reports the level of consistency of ^{235}U spectrum measurements ... ...

    Abstract A joint determination of the reactor antineutrino spectra resulting from the fission of ^{235}U and ^{239}Pu has been carried out by the Daya Bay and PROSPECT Collaborations. This Letter reports the level of consistency of ^{235}U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant ^{235}U and ^{239}Pu isotopes and improves the uncertainty of the ^{235}U spectral shape to about 3%. The ^{235}U and ^{239}Pu antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the ^{235}U and ^{239}Pu spectra based on the combination of experiments at low- and highly enriched uranium reactors.
    Language English
    Publishing date 2022-03-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.128.081801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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