E-resources
PDF-
Adey, D.; Band, H. R.; Blyth, S.; Cao, G. F.; Chang, Y.; Chen, S. M.; Chen, Y. X.; Cheng, J.; Cheng, Z. K.; Chu, M. C.; Chukanov, A.; Dash, N.; Deng, F. S.; Dohnal, T.; Dove, J.; Dvořák, M.; Gonchar, M.; Gu, W. Q.; Guo, X. H.; Guo, Y. H.; He, M.; Heng, Y. K.; Higuera, A.; Hor, Y. K.; Hsiung, Y. B.; Hu, T.; Hu, Z. J.; Huang, H. X.; Huang, Y. B.; Jen, K. L.; Ji, X. L.; Ji, X. P.; Jones, D.; Kettell, S. H.; Kohn, S.; Kramer, M.; Langford, T. J.; Lee, J.; Lei, R. T.; Leitner, R.; Li, C.; Li, F.; Li, S.; Li, S. C.; Li, S. J.; Li, W. D.; Li, Z. B.; Lin, C. J.; Lin, G. L.; Lin, S.; Link, J. M.; Littenberg, L.; Littlejohn, B. R.; Liu, J. C.; Liu, Y.; Liu, Y. H.; Lu, H. Q.; Lu, J. S.; Luk, K. B.; Ma, X. B.; Ma, Y. Q.; McDonald, K. T.; McKeown, R. D.; Mitchell, I.; Napolitano, J.; Naumov, D.; Naumova, E.; Olshevskiy, A.; Patton, S.; Peng, J. C.; Pinsky, L.; Qian, X.; Rosero, R.; Sun, J. L.; Treskov, K.; Viren, B.; Vorobel, V.; Wang, M.; Wang, W.; Wang, Y.; Wang, Z.; Wang, Z. M.; Wen, L. J.; White, C. G.; Wong, S. C. F.; Wu, W. J.; Xing, Z. Z.; Xu, J. L.; Yang, L.; Yang, M. S.; Ye, M.; Yeh, M.; Zhang, C.; Zhang, F. Y.; Zhang, J. W.; Zhang, X. F.; Zhang, Y. M.; Zhang, Y. Y.; Zhang, Z. J.; Zou, J. H.
Physical review letters, 09/2019, Volume: 123, Issue: 11Journal Article
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.
