- Main
Extraction of the ^{235}U and ^{239}Pu Antineutrino Spectra at Daya Bay.
- Author(s): Adey, D
- An, FP
- Balantekin, AB
- Band, HR
- Bishai, M
- Blyth, S
- Cao, D
- Cao, GF
- Cao, J
- Chang, JF
- Chang, Y
- Chen, HS
- Chen, SM
- Chen, Y
- Chen, YX
- Cheng, J
- Cheng, ZK
- Cherwinka, JJ
- Chu, MC
- Chukanov, A
- Cummings, JP
- Dash, N
- Deng, FS
- Ding, YY
- Diwan, MV
- Dohnal, T
- Dove, J
- Dvořák, M
- Dwyer, DA
- Gonchar, M
- Gong, GH
- Gong, H
- Gu, WQ
- Guo, JY
- Guo, L
- Guo, XH
- Guo, YH
- Guo, Z
- Hackenburg, RW
- Hans, S
- He, M
- Heeger, KM
- Heng, YK
- Higuera, A
- Hor, YK
- Hsiung, YB
- Hu, BZ
- Hu, JR
- Hu, T
- Hu, ZJ
- Huang, HX
- Huang, XT
- Huang, YB
- Huber, P
- Jaffe, DE
- Jen, KL
- Ji, XL
- Ji, XP
- Johnson, RA
- Jones, D
- Kang, L
- Kettell, SH
- Koerner, LW
- Kohn, S
- Kramer, M
- Langford, TJ
- Lee, J
- Lee, JHC
- Lei, RT
- Leitner, R
- Leung, JKC
- Li, C
- Li, F
- Li, HL
- Li, QJ
- Li, S
- Li, SC
- Li, SJ
- 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, Y
- Liu, YH
- Lu, C
- Lu, HQ
- Lu, JS
- Luk, KB
- Ma, XB
- Ma, XY
- Ma, YQ
- Marshall, C
- Martinez Caicedo, DA
- McDonald, KT
- McKeown, RD
- Mitchell, I
- Mora Lepin, L
- Napolitano, J
- Naumov, D
- Naumova, E
- Ochoa-Ricoux, JP
- Olshevskiy, A
- Pan, H-R
- Park, J
- Patton, S
- Pec, V
- Peng, JC
- Pinsky, L
- Pun, CSJ
- Qi, FZ
- Qi, M
- Qian, X
- Raper, N
- Ren, J
- Rosero, R
- Roskovec, B
- Ruan, XC
- Steiner, H
- Sun, JL
- Treskov, K
- Tse, W-H
- Tull, CE
- Viren, B
- Vorobel, V
- Wang, CH
- Wang, J
- Wang, M
- Wang, NY
- Wang, RG
- Wang, W
- Wang, W
- Wang, X
- Wang, Y
- Wang, YF
- Wang, Z
- Wang, Z
- Wang, ZM
- Wei, HY
- Wei, LH
- Wen, LJ
- Whisnant, K
- White, CG
- Wong, HLH
- Wong, SCF
- Worcester, E
- Wu, Q
- Wu, WJ
- Xia, DM
- Xing, ZZ
- Xu, JL
- Xue, T
- Yang, CG
- Yang, L
- Yang, MS
- Yang, YZ
- Ye, M
- Yeh, M
- Young, BL
- Yu, HZ
- Yu, ZY
- Yue, BB
- Zeng, S
- Zeng, Y
- Zhan, L
- Zhang, C
- Zhang, CC
- Zhang, FY
- Zhang, HH
- Zhang, JW
- Zhang, QM
- Zhang, R
- Zhang, XF
- Zhang, XT
- Zhang, YM
- Zhang, YM
- Zhang, YX
- Zhang, YY
- Zhang, ZJ
- Zhang, ZP
- Zhang, ZY
- Zhao, J
- Zhou, L
- Zhuang, HL
- Zou, JH
- Daya Bay Collaboration
- et al.
Abstract
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.
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