학술논문
Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
Document Type
article
Author
An, FP; Bai, WD; Balantekin, AB; Bishai, M; Blyth, S; Cao, GF; Cao, J; Chang, JF; Chang, Y; Chen, HS; Chen, HY; Chen, SM; Chen, Y; Chen, YX; Cheng, J; Cheng, Y-C; Cheng, ZK; Cherwinka, JJ; Chu, MC; Cummings, JP; Dalager, O; Deng, FS; Ding, YY; Diwan, MV; Dohnal, T; Dolzhikov, D; Dove, J; Dugas, KV; Duyang, HY; Dwyer, DA; Gallo, JP; Gonchar, M; Gong, GH; Gong, H; Gu, WQ; Guo, JY; Guo, L; Guo, XH; Guo, YH; Guo, Z; Hackenburg, RW; Han, Y; Hans, S; He, M; Heeger, KM; Heng, YK; Hor, YK; Hsiung, YB; Hu, BZ; Hu, JR; Hu, T; Hu, ZJ; Huang, HX; Huang, JH; Huang, XT; Huang, YB; Huber, P; Jaffe, DE; Jen, KL; Ji, XL; Ji, XP; Johnson, RA; Jones, D; Kang, L; Kettell, SH; Kohn, S; Kramer, M; Langford, TJ; Lee, J; Lee, JHC; Lei, RT; Leitner, R; Leung, JKC; Li, F; Li, HL; Li, JJ; Li, QJ; Li, RH; Li, S; Li, SC; 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, JX; Lu, C; Lu, HQ; Luk, KB
Source
Physical Review Letters. 130(21)
Subject
Language
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.