/ hep-ex arXiv:1508.04233


Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay


An, Feng Peng (East China U. Sci. Tech.) ; Balantekin, Akif Baha (Wisconsin U., Madison) ; Band, Henry Reyer (Yale U.) ; Bishai, Mary R (Brookhaven) ; Blyth, Simon (Natl. United U., Taiwan) ; Butorov, Ilya (Dubna, JINR) ; Cao, De Wen (Nanjing U.) ; Cao, Guo Fu (Beijing, Inst. High Energy Phys.) ; Cao, Jun (Beijing, Inst. High Energy Phys.) ; Cen, Wu Rong (Beijing, Inst. High Energy Phys.) ; Chan, Yat Long (Hong Kong, Chinese U.) ; Chang, Jin Fan (Beijing, Inst. High Energy Phys.) ; Chang, Li Chu (Taiwan, Natl. Chiao Tung U.) ; Chang, Yun (Natl. United U., Taiwan) ; Chen, He Sheng (Beijing, Inst. High Energy Phys.) ; Chen, Quan You (Shandong U.) ; Chen, Shao Min (Tsinghua U., Beijing) ; Chen, Yixue (Beijing, North China Elec. Power U.) ; Chen, Yu (Shenzhen U.) ; Cheng, Jia Hua (Taiwan, Natl. Chiao Tung U.) ; Cheng, Jie (Shandong U.) ; Cheng, Ya Ping (Beijing, Inst. High Energy Phys.) ; Cherwinka, JeffJ (Wisconsin U., Madison) ; Chu, Mingchung (Hong Kong, Chinese U.) ; Cummings, JohnP (Siena Coll., Loudonville) ; de Arcos, Jose (IIT, Chicago) ; Dove, Jason (Illinois U., Urbana) ; Deng, Zi Yan (Beijing, Inst. High Energy Phys.) ; Ding, Xue Feng (Beijing, Inst. High Energy Phys.) ; Ding, Ya Yun (Beijing, Inst. High Energy Phys.) ; Diwan, Milind Vaman (Brookhaven) ; Draeger, Emily Ann (IIT, Chicago) ; Dwyer, Daniel A (LBL, Berkeley) ; Edwards, William R (LBL, Berkeley) ; Ely, SRy (Illinois U., Urbana) ; Gill, Ronald (Brookhaven) ; Gonchar, Maxim (Dubna, JINR) ; Gong, Guang Hua (Tsinghua U., Beijing) ; Gong, Hui (Tsinghua U., Beijing) ; Grassi, Marco (Beijing, Inst. High Energy Phys.) ; Gu, Wen Qiang (Shanghai Jiaotong U.) ; Guan, Meng Yun (Beijing, Inst. High Energy Phys.) ; Guo, Lei (Tsinghua U., Beijing) ; Guo, Xin Heng (Beijing Normal U.) ; Hackenburg, Robert W (Brookhaven) ; Han, Ran (Beijing, North China Elec. Power U.) ; Hans, Sunej (Brookhaven) ; He, Miao (Beijing, Inst. High Energy Phys.) ; Heeger, Karsten Miklas (Yale U.) ; Heng, Yue Kun (Beijing, Inst. High Energy Phys.) ; Higuera, Aaron (Houston U.) ; Hor, Joseph Yuen-Keung (Virginia Tech.) ; Hsiung, Yee Bob (Taiwan, Natl. Taiwan U.) ; Hu, Bei Zhen (Taiwan, Natl. Taiwan U.) ; Hu, Liang Ming (Brookhaven) ; Hu, Li Jun (Beijing Normal U.) ; Hu, Tao (Beijing, Inst. High Energy Phys.) ; Hu, Wei (Beijing, Inst. High Energy Phys.) ; Huang, En Chuan (Illinois U., Urbana) ; Huang, Han Xiong (Beijing, Inst. Atomic Energy) ; Huang, Xing Tao (Shandong U.) ; Huber, Patrick (Virginia Tech.) ; Hussain, Ghulam (Tsinghua U., Beijing) ; Jaffe, David Edward (Brookhaven) ; Jaffke, Patrick (Virginia Tech.) ; Jen, Kou Lun (Taiwan, Natl. Chiao Tung U.) ; Jetter, Soeren (Beijing, Inst. High Energy Phys.) ; Ji, Xiang Pan (Tsinghua U., Beijing) ; Ji, Xiao Lu (Beijing, Inst. High Energy Phys.) ; Jiao, Jian Bin (Shandong U.) ; Johnson, Randy Allan (Cincinnati U.) ; Kang, Li (DongGuan U. Technol.) ; Kettell, Steven H (Brookhaven) ; Kohn, Sam (UC, Berkeley) ; Kramer, Matt (UC, Berkeley) ; Kwan, Kin Keung (Hong Kong, Chinese U.) ; Kwok, Man-wai (Hong Kong, Chinese U.) ; Kwok, Talent (Hong Kong U.) ; Langford, Thomas J (Yale U.) ; Lau, Kwong Hon (Houston U.) ; Lebanowski, Logan (Tsinghua U., Beijing) ; Lee, Jason (LBL, Berkeley) ; Lei, Rui Ting (DongGuan U. Technol.) ; Leitner, Rupert (Charles U.) ; Leung, Amy Kar-Yee (Hong Kong U.) ; Leung, John Kon Chong (Hong Kong U.) ; Lewis, Christine Anne (Wisconsin U., Madison) ; Li, Deng Jie (Hefei, CUST) ; Li, Fei (Beijing, Inst. High Energy Phys.) ; Li, Gao Song (Shanghai Jiaotong U.) ; Li, Qiu Ju (Beijing, Inst. High Energy Phys.) ; Li, Sheng Chao (Hong Kong U.) ; Li, Wei Dong (Beijing, Inst. High Energy Phys.) ; Li, Xiao Nan (Beijing, Inst. High Energy Phys.) ; Li, Xue Qian (Nankai U.) ; Li, Yu Feng (Beijing, Inst. High Energy Phys.) ; Li, Zhi Bing (Zhongshan U.) ; Liang, Hao (Hefei, CUST) ; Lin, Cheng-Ju Stephen (LBL, Berkeley) ; Lin, Guey Lin (Taiwan, Natl. Chiao Tung U.) ; Lin, Ping Yen (Taiwan, Natl. Chiao Tung U.) ; Lin, Shih Kai (Houston U.) ; Ling, Jia Jie (Illinois U., Urbana) ; Link, Jonathan Marion (Virginia Tech.) ; Littenberg, Laurence S (Brookhaven) ; Littlejohn, Bryce R (IIT, Chicago) ; Liu, Da Wei (Houston U.) ; Liu, Hu (Houston U.) ; Liu, Jiang Lai (Shanghai Jiaotong U.) ; Liu, Jin Chang (Beijing, Inst. High Energy Phys.) ; Liu, Si Shou (Hong Kong U.) ; Lu, Chang Guo (Princeton U.) ; Lu, Hao Qi (Beijing, Inst. High Energy Phys.) ; Lu, Jia Shu (Beijing, Inst. High Energy Phys.) ; Luk, Kam Biu (LBL, Berkeley) ; Ma, Qiu Mei (Beijing, Inst. High Energy Phys.) ; Ma, Xiao Yan (Beijing, Inst. High Energy Phys.) ; Ma, Xu Bo (Beijing, North China Elec. Power U.) ; Ma, Yu Qian (Beijing, Inst. High Energy Phys.) ; Martinez Caicedo, David A (IIT, Chicago) ; McDonald, Kirk T (Princeton U.) ; McKeown, Robert D (William-Mary Coll.) ; Meng, Yue (Virginia Tech.) ; Mitchell, Ian (Houston U.) ; Monari Kebwaro, Jeremiah (Xian Jiaotong U.) ; Nakajima, Yasuhiro (LBL, Berkeley) ; Napolitano, James Justin (Temple U.) ; Naumov, Dmitry Vadimovich (Dubna, JINR) ; Naumova, Elena (Dubna, JINR) ; Ngai, Jimmy (Hong Kong U.) ; Ning, Zhe (Beijing, Inst. High Energy Phys.) ; Ochoa-Ricoux, Juan Pedro (Chile U., Catolica) ; Olshevski, Alexander (Dubna, JINR) ; Pan, Hsiao-Ru (Taiwan, Natl. Taiwan U.) ; Park, Jaewon (Virginia Tech.) ; Patton, Simon John (LBL, Berkeley) ; Pec, Viktor (Charles U.) ; Peng, Jen Chieh (Illinois U., Urbana) ; Piilonen, Leo E (Virginia Tech.) ; Pinsky, Lawrence S (Houston U.) ; Pun, Jason CS (Hong Kong U.) ; Qi, Fa Zhi (Beijing, Inst. High Energy Phys.) ; Qi, Ming (Nanjing U.) ; Qian, Xin (Brookhaven) ; Raper, Neill (Rensselaer Poly.) ; Ren, Bin (DongGuan U. Technol.) ; Ren, Jie (Beijing, Inst. Atomic Energy) ; Rosero, Richard (Brookhaven) ; Roskovec, Bedrich (Charles U.) ; Ruan, Xi Chao (Beijing, Inst. Atomic Energy) ; Shao, Bei Bei (Tsinghua U., Beijing) ; Steiner, Herbert M (LBL, Berkeley) ; Sun, Gong Xing (Beijing, Inst. High Energy Phys.) ; Sun, Ji Liang (CGNPC, Shenzhen) ; Tang, Wei (Brookhaven) ; Taychenachev, Dmitriy (Dubna, JINR) ; Tsang, Ka Vang (LBL, Berkeley) ; Tull, Craig E (LBL, Berkeley) ; Tung, Yu Chen (Taiwan, Natl. Taiwan U.) ; Viaux, Nicolás (Chile U., Catolica) ; Viren, Brett Michael (Brookhaven) ; Vorobel, Vit (Charles U.) ; Wang, Chung Hsiang (Natl. United U., Taiwan) ; Wang, Meng (Shandong U.) ; Wang, Nai Yan (Beijing Normal U.) ; Wang, Rui Guang (Beijing, Inst. High Energy Phys.) ; Wang, Wei (Zhongshan U.) ; Wang, Wen Wen (Nanjing U.) ; Wang, Xi (Natl. U. Defense Tech., Hunan) ; Wang, Yi Fang (Beijing, Inst. High Energy Phys.) ; Wang, Zhe (Tsinghua U., Beijing) ; Wang, Zheng (Beijing, Inst. High Energy Phys.) ; Wang, Zhi Min (Beijing, Inst. High Energy Phys.) ; Wei, Han Yu (Tsinghua U., Beijing) ; Wen, Liang Jian (Beijing, Inst. High Energy Phys.) ; Whisnant, Kerry L. (Iowa State U.) ; White, Christopher Gerard (IIT, Chicago) ; Whitehead, Lisa Angelika (Houston U.) ; Wise, Thomas S. (Wisconsin U., Madison) ; Wong, Hin-Lok Henoch (LBL, Berkeley) ; Wong, Chan Fai (Zhongshan U.) ; Worcester, Elizabeth Turner (Brookhaven) ; Wu, Qun (Shandong U.) ; Xia, Dong Mei (Chongqing U.) ; Xia, Jing Kai (Beijing, Inst. High Energy Phys.) ; Xia, Xin (Shandong U.) ; Xing, Zhi Zhong (Beijing, Inst. High Energy Phys.) ; Xu, Jian Yi (Hong Kong, Chinese U.) ; Xu, Ji Lei (Beijing, Inst. High Energy Phys.) ; Xu, Jing (Beijing Normal U.) ; Xu, Ye (Nankai U.) ; Xue, Tao (Tsinghua U., Beijing) ; Yan, Jun (Xian Jiaotong U.) ; Yang, Chang Gen (Beijing, Inst. High Energy Phys.) ; Yang, Lei (DongGuan U. Technol.) ; Yang, Ma Sheng (Beijing, Inst. High Energy Phys.) ; Yang, Meng Ting (Shandong U.) ; Ye, Mei (Beijing, Inst. High Energy Phys.) ; Yeh, Min Fang (Brookhaven) ; Young, Bing Lin (Iowa State U.) ; Yu, Guang You (Nanjing U.) ; Yu, Ze Yuan (Beijing, Inst. High Energy Phys.) ; Zang, Shi Lei (Nanjing U.) ; Zhan, Liang (Beijing, Inst. High Energy Phys.) ; Zhang, Chao (Brookhaven) ; Zhang, Hong Hao (Zhongshan U.) ; Zhang, Jia Wen (Beijing, Inst. High Energy Phys.) ; Zhang, Qing Min (Xian Jiaotong U.) ; Zhang, Yi Ming (Tsinghua U., Beijing) ; Zhang, Yi Xin (CGNPC, Shenzhen) ; Zhang, Yu Mei (Zhongshan U.) ; Zhang, Zhi Jian (DongGuan U. Technol.) ; Zhang, Zhi Yong (Beijing, Inst. High Energy Phys.) ; Zhang, Zi Ping (Hefei, CUST) ; Zhao, Jie (Beijing, Inst. High Energy Phys.) ; Zhao, Qing Wang (Beijing, Inst. High Energy Phys.) ; Zhao, Yan Fei (Beijing, North China Elec. Power U.) ; Zhao, Yu Bin (Beijing, Inst. High Energy Phys.) ; Zheng, L. (Hefei, CUST) ; Zhong, Wei Li (Beijing, Inst. High Energy Phys.) ; Zhou, Li (Beijing, Inst. High Energy Phys.) ; Zhou, Nan (Hefei, CUST) ; Zhuang, Hong Lin (Beijing, Inst. High Energy Phys.) ; Zou, Jia Heng (Beijing, Inst. High Energy Phys.)

Abstract: This Letter reports a measurement of the flux and energy spectrum of electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with six detectors deployed in two near (effective baselines 512~m and 561~m) and one far (1,579~m) underground experimental halls in the Daya Bay experiment. Using 217 days of data, 296,721 and 41,589 inverse beta decay (IBD) candidates were detected in the near and far halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 $\pm$ 0.14) $\times$ 10$^{-43}$~cm$^2$/fission. This flux measurement is consistent with previous short-baseline reactor antineutrino experiments and is $0.946\pm0.022$ ($0.991\pm0.023$) relative to the flux predicted with the Huber+Mueller (ILL+Vogel) fissile antineutrino model. The measured IBD positron energy spectrum deviates from both spectral predictions by more than 2$\sigma$ over the full energy range with a local significance of up to $\sim$4$\sigma$ between 4-6 MeV. A reactor antineutrino spectrum of IBD reactions is extracted from the measured positron energy spectrum for model-independent predictions.

Web-Page: http://inspirehep.net/record/1388361/files/generic_pre.png; http://inspirehep.net/record/1388361/files/absflux.png; http://inspirehep.net/record/1388361/files/spectrum_comparison_wide_bin_nolabel.png; http://inspirehep.net/record/1388361/files/fig2-bot.png; http://inspirehep.net/record/1388361/files/arXiv:1508.04233.pdf


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