Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications *

An, F.P.; Balantekin, A. B.; Band, H. R.; Bishai, M.; Blyth, S.; Cao, G. F.; Cao, Junpeng; Chang, J. F.; Chang, Yun Hsuan; Chen, H. S.; Chen, S. M.; Chen, Y.; Chen, Y. X.; Cheng, Jie; Cheng, Z. K.; Cherwinka, J. J.; Chu, M. C.; Cummings, J. P.; Dalager, Olivia; Deng, F. S.; Ding, Yayun; Diwan, M. V.; Dohnal, Tadeáš; Dove, J.; Dvořák, Martin; Dwyer, D. A.; Gallo, J. P.; Gonchar, M.; Gong, Guanghua; Gong, H.; Gu, W.; Guo, Jingyuan; Guo, L.; Guo, Xin-Heng; Guo, Yuhang; Guo, Ziyi; Hackenburg, R.; Hans, S.; He, M.; Heeger, K. M.; Heng, Y. K.; Higuera, A.; Hor, Y. K.; Hsiung, Y.; Hu, Bei-Zhen; Hu, Jun; Hu, T.; Hu, Z. J.; Huang, Hanxiong; Huang, X. T.; Huang, Yongbo; Huber, Patrick; Jaffe, D. E.; Jen, K. L.; Ji, X. L.; Ji, X.; Johnson, R. A.; Jones, D.; Li, Kang; Kettell, S. H.; Kohn, S.; Krämer, M.; Langford, T.; Lee, J.; Lee, J. H. C.; Lei, Ruiting; Leitner, R.; Leung, J. K. C.; Li, F.; Li, J. J.; Li, Q. J.; 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, Jiajie; Link, J. M.; Littenberg, L.; Littlejohn, B. R.; Liu, J. C.; Liu, J. L.; Lu, C.; Lu, Haoqi; Lu, J. S.; Luk, K. B.; B., X.; Y., X.; Q., Y.; Marshall, C.; Caicedo, D. A. Martínez; McDonald, Kirk T.; McKeown, R. D.; Meng, Y.; Napolitano, J.; Naumov, D.; Наумова, Э.; 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, Jie; Reveco, C. Morales; Rosero, R.; Roskovec, B.; Ruan, X. C.; Steiner, H.; Sun, Jian; Tměj, Tomáš; Treskov, Konstantin; 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.; Wei, Lianghong; Wen, L.; Whisnant, K.; White, C.; Wong, H. L. H.; Worcester, E.; Wu, Diru; Wu, Fangliang; Wu, Qun; Wu, W.; Xia, Dongmei; Xie, Z.; Xing, Zhi-zhong; Xu, Jing; Xu, T.; Xue, T.; Yang, Changgen; Yang, Lei; Yang, Yifan; Yao, Haifeng; Ye, M.; Yeh, M.; Young, Ben; Yu, Hongzhao; Yu, Zezhong; Yue, Baobiao; Zeng, S.; Zeng, Yuda; Zhan, Liang; Zhang, C.; Zhang, F. Y.; Zhang, H. H.; Zhang, J. W.; Zhang, Q. M.; Zhang, X. T.; Zhang, Y. M.; Zhang, Y. X.; Zhang, Y. Y.; Zhang, Z. J.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, J.; Li, Zhou; Zhuang, H. L.; Zou, J. H.

doi:10.1088/1674-1137/abfc38

Cited by 24 publications

(23 citation statements)

References 60 publications

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“…This jointly unfolded spectrum, not dependent on any other fuel isotopes, indicates the existence of a event excess for the 235 U isotope. Moreover, this spectrum is found to be compatible with the 235 U spectrum extracted by the Daya Bay collaboration [14] with LEU fuel. The best-fit amplitude of the event excess in the joint spectrum is 𝐴 = (9.9 ± 3.3)%, indicating that the excess of events observed in LEU experiments [3][4][5][6] cannot be explained by 235 U only.…”

Section: Pos(eps-hep2021)226supporting

confidence: 75%

Joint measurement of the pure-235 U reactor antineutrino spectrum by STEREO and PROSPECT experiments

Licciardi¹

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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Sand P are two high-precision very-short-baseline experiments studying 235 U antineutrinos produced by highly-enriched nuclear fuel. Located at about 10 meters from reactor cores at the research facilities of Institut Laue-Langevin (Grenoble, France) and Oak Ridge National Laboratory (U.S.A.), respectively, they investigate the data-to-prediction distortions on the 235 U antineutrino spectrum in terms of normalization ("Reactor Antineutrino Anomaly") or shape ("5-MeV bump"). Here, we report a joint spectral analysis performed by the S and P collaborations. The two experimental energy spectra have been found to be compatible (𝜒 2 /ndf = 24.1/21), allowing a simultaneous unfolding of the prompt spectra into antineutrino energy, which provides a new reference spectrum for the 235 U isotope. When compared to the shape of the Huber model, an excess of events around 5-6 MeV is observed with 2.4𝜎 significance. This measurement also proves to be consistent and complementary with the results from experiments using low-enriched nuclear fuel, where several isotopes contribute to the antineutrino spectrum.

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Section: Pos(eps-hep2021)226supporting

confidence: 75%

Joint measurement of the pure-235 U reactor antineutrino spectrum by STEREO and PROSPECT experiments

Licciardi¹

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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“…[28], but have not resolved the reactor antineutrino anomaly. Global analyses of past reactor neutrino data [29][30][31], precise neutrino-spectrum measurements [32] and fuel-evolution measurements [33] have been indicating for a while that there might be a problem with the prediction for uranium-235. The recent absolute flux determination from a reactor with only uranium-235 fission by the STEREO experiment [34] confirms this.…”

mentioning

confidence: 99%

Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

Berryman,

Coloma,

Huber

et al. 2021

Preprint

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We evaluate the statistical significance of the 3+1 sterile-neutrino hypothesis using ν e and νe disappearance data from reactor, solar and gallium radioactive source experiments. Concerning the latter, we investigate the implications of the recent BEST results. For reactor data we focus on relative measurements independent of flux predictions. For the problem at hand, the usual χ 2 -approximation to hypothesis testing based on Wilks' theorem has been shown in the literature to be inaccurate. We therefore present results based on Monte Carlo simulations, and find that this typically reduces the significance by roughly 1 σ with respect to the naïve expectation. We find no significant indication of sterile-neutrino oscillations from reactor data. On the other hand, gallium data (dominated by the BEST result) show more than 5 σ of evidence supporting the sterile-neutrino hypothesis, favoring oscillation parameters in agreement with reactor data. This explanation is, however, in significant tension (∼ 3 σ) with solar neutrino experiments. In order to assess the robustness of the signal for gallium experiments we present a discussion of the impact of cross-section uncertainties on the results.

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“…Daya Bay in a recent paper deconvolves the detector response from the directly measured IBD sample and extracts 235 U, 239 Pu and Pu combo prompt-energy spectra to produce spectra in νe energy. 77 Here Pu combo is the combined spectra from 239 Pu and 241 Pu since the evolution of these spectra are correlated. These νe spectra can then be utilized to predict the IBD energy spectrum from an arbitrary reactor A with fission fractions (f A 235 , f A 239 , f A 241 , f A 238 ) as S A = S total + ∆f 235 S 235 + ∆f 239 S combo + ∆f 238 S 238 + (∆f 241 − q × ∆f 239 )S 241 (7) where ∆f…”

Section: Measuring the Reactor νE Flux And Spectrummentioning

confidence: 99%

A Decade of Discoveries by the Daya Bay Reactor Neutrino Experiment

Jaffe

2021

Preprint

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Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications *

Abstract: The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era. The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the

Cited by 24 publications

References 60 publications

Joint measurement of the pure-235 U reactor antineutrino spectrum by STEREO and PROSPECT experiments

Joint measurement of the pure-235 U reactor antineutrino spectrum by STEREO and PROSPECT experiments

Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

A Decade of Discoveries by the Daya Bay Reactor Neutrino Experiment

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