/ hep-ex arXiv:1607.05378


Improved 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) ; Cao, De Wen (Nanjing U.) ; Cao, Guo Fu (Beijing, Inst. High Energy Phys.) ; Cao, Jun (Beijing, Inst. High Energy Phys.) ; Wuron, Cen (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.) ; Cheng, Zhaokan (Zhongshan U.) ; Cherwinka, JeffJ (Wisconsin U., Madison) ; Chu, Mingchung (Hong Kong, Chinese U.) ; Chukanov, Artem (Dubna, JINR) ; Cummings, JohnP (Siena Coll., Loudonville) ; Deng, Zi Yan (Beijing, Inst. High Energy Phys.) ; Xuefeng, Ding (Beijing, Inst. High Energy Phys.) ; Ding, Ya Yun (Beijing, Inst. High Energy Phys.) ; Diwan, Milind Vaman (Brookhaven) ; Dolgareva, Maria (Dubna, JINR) ; Dove, Jason (Illinois U., Urbana) ; Dwyer, Daniel A (LBL, Berkeley) ; Edwards, William R (LBL, Berkeley) ; Gonchar, Maxim (Dubna, JINR) ; Gill, Ronald (Brookhaven) ; 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) ; Rupan, Guo (Beijing, Inst. High Energy Phys.) ; Guo, Xin Heng (Beijing Normal U.) ; Guo, Ziyi (Tsinghua U., Beijing) ; Hussain, Ghulam (Tsinghua U., Beijing) ; Hackenburg, Robert W (Brookhaven) ; Han, Ran (Beijing, North China Elec. Power U.) ; Hans, Sunej (Bronx Community College) ; 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, 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.) ; Huo, Wenju (Hefei, CUST) ; 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.) ; Joshi, J (Brookhaven) ; 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.) ; Loh, Changwei (Nanjing U.) ; Langford, Thomas J (Yale U.) ; Lau, Kwong Hon (Houston U.) ; Lebanowski, Logan (Tsinghua U., Beijing) ; Lee, Jason (LBL, Berkeley) ; Lee, Jenny HC (Hong Kong U.) ; Lei, Rui Ting (DongGuan U. Technol.) ; Leitner, Rupert (Charles U.) ; Li, Chao (Shandong U.) ; 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, Shanfeng (DongGuan U. Technol.) ; Li, Sheng Chao (Virginia Tech.) ; Li, Wei Dong (Beijing, Inst. High Energy Phys.) ; Li, Xiao Nan (Beijing, Inst. High Energy Phys.) ; 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, Shengxin (DongGuan U. Technol.) ; Lin, Shih Kai (Houston U.) ; Lin, Yu-Cheng (Taiwan, Natl. Taiwan. U.) ; Ling, Jia Jie (Zhongshan U.) ; Link, Jonathan Marion (Virginia Tech.) ; Littenberg, Laurence S (Brookhaven) ; Littlejohn, Bryce R (IIT, Chicago) ; Liu, Da Wei (Houston U.) ; Liu, Jiang Lai (Shanghai Jiaotong U.) ; Liu, Jin Chang (Beijing, Inst. High Energy Phys.) ; 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) ; Lv, Zhipeng (Xian Jiaotong U.) ; 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.) ; Malyshkin, Yury (Chile U., Catolica) ; Martinez Caicedo, David A (IIT, Chicago) ; McDonald, Kirk T (Princeton U.) ; McKeown, Robert D (William-Mary Coll.) ; Mitchell, Ian (Houston U.) ; Mooney, Michael Ryan (Brookhaven) ; 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.) ; Olshevskiy, Alexander (Dubna, JINR) ; Ochoa-Ricoux, Juan Pedro (Chile U., Catolica) ; 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) ; 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) ; Ren, Jie (Beijing, Inst. Atomic Energy) ; Raper, Neill (Rensselaer Poly.) ; Rosero, Richard (Brookhaven) ; Roskovec, Bedrich (Charles U.) ; Ruan, Xi Chao (Beijing, Inst. Atomic Energy) ; 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) ; Treskov, Konstantin (Dubna, JINR) ; Tsang, Ka Vang (LBL, Berkeley) ; Tull, Craig E (LBL, Berkeley) ; 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 (William-Mary Coll.) ; 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, Chia-Hao (Taiwan, Natl. Chiao Tung U.) ; Wu, Qun (Shandong U.) ; Wu, Wenjie (Beijing, Inst. High Energy Phys.) ; Xia, Dong Mei (Chongqing U.) ; Xia, Jing Kai (Beijing, Inst. High Energy Phys.) ; Xing, Zhi Zhong (Beijing, Inst. High Energy Phys.) ; Xu, Jian Yi (Hong Kong, Chinese U.) ; Xu, Ji Lei (Beijing, Inst. High Energy Phys.) ; Xu, Ye (Zhongshan U.) ; Xue, Tao (Tsinghua U., Beijing) ; Yang, Chang Gen (Beijing, Inst. High Energy Phys.) ; Yang, Haibo (Nanjing U.) ; 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.) ; Ye, Ziping (Houston U.) ; Yeh, Min Fang (Brookhaven) ; Young, Bing Lin (Iowa State U.) ; Yu, Ze Yuan (Beijing, Inst. High Energy Phys.) ; Zeng, Shan (Beijing, Inst. High Energy Phys.) ; 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, Xuantong (Beijing, Inst. High Energy Phys.) ; 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.) ; Qiwang, Zhao (Beijing, Inst. High Energy Phys.) ; Zhao, Yu Bin (Beijing, Inst. High Energy Phys.) ; 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.) ; Jose, de Arcos (IIT, Chicago)

Pages: 35

Abstract: A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GW$_{\mathrm{th}}$ nuclear reactors and detected by eight antineutrino detectors deployed in two near (510~m and 560~m flux-weighted baselines) and one far (1580~m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be $0.946\pm0.020$ ($0.992\pm0.021$) for the Huber+Mueller (ILL+Vogel) model. A 2.9 $\sigma$ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6~MeV was found in the measured spectrum, with a local significance of 4.4 $\sigma$. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

Web-Page: http://inspirehep.net/record/1477024/files/arXiv:1607.05378.pdf


Note: *Temporary entry*; 35 pages, 29 figures

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