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1. Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

Author

Y. X. Wang, X. L. Zhu, S. M. Weng, P. Li, X. F. Li, H. Ai, H. R. Pan, and Z. M. Sheng

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The generation of ultrashort high-power light sources in the mid-infrared (mid-IR) to terahertz (THz) range is of interest for applications in a number of fields, from fundamental research to biology and medicine. Besides conventional laser technology, photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or THz pulses. Here, we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or THz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long wavelength. The signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver pulse. Owing to its relatively long wavelength, the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake bubble. Consequently, the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer wavelengths. This greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and THz spectral ranges.

Published
2024
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2. Antineutrino Energy Spectrum Unfolding Based on the Daya Bay Measurement and Its Applications

Author

Jinjuan Ren, Dmitry Dolzhikov, Haifeng Li, Yuman Wang, S. Zeng, W. Q. Gu, Z. M. Wang, X. L. Ji, Minfang Yeh, Y. X. Zhang, C. Morales Reveco, Michael Kramer, Yufeng Li, K. L. Jen, Tomas Tmej, J. P. Gallo, Chun S. J. Pun, Zhuojun Hu, Shaomin Chen, Jun Cao, Haifeng Yao, J. J. Cherwinka, S. F. Li, Bangzheng Ma, Dmitry V. Naumov, Yinhong Zhang, Yongzhu Chen, Yue Meng, Q. J. Li, H. R. Pan, Kam-Biu Luk, N. Raper, H. Liang, Yixue Chen, Hongzhao Yu, Olivia Dalager, Z. Guo, D. C. Jones, Hanxiong Huang, L. Kang, N. Y. Wang, B. Viren, X. T. Huang, Tianpeng Xu, A. B. Balantekin, C. G. Yang, Zhi-zhong Xing, Baobiao Yue, W. J. Wu, Y. Z. Yang, R. D. McKeown, C. E. Tull, S. Kohn, L. H. Wei, Rong Zhao, R. T. Lei, F. Li, Simon Blyth, R. C. Mandujano, Guanghua Gong, Li Zhou, S. Hans, M. Z. Wang, Ming Chung Chu, W. H. Tse, Diru Wu, M. Ye, Jingyuan Guo, Chi Lin, K. T. McDonald, F. L. Wu, Jen-Chieh Peng, Y. K. Hor, Jianrun Hu, Qinglong Wu, Junwei Huang, Jianglai Liu, J. Dove, Yuda Zeng, J. M. Link, J. P. Cummings, L. Guo, Alexander Olshevskiy, M. Qi, Tian Xue, M. Bishai, Chao Zhang, S. J. Patton, Y. K. Heng, H. S. Chen, Xiaohui Qian, J. Lee, H. Y. Wei, K. M. Heeger, Zhijian Zhang, Rupert Leitner, L. S. Littenberg, H. L. H. Wong, H. H. Zhang, H. L. Zhuang, K. Treskov, Richard Rosero, Juan Pedro Ochoa-Ricoux, X. Wang, J. J. Ling, B. R. Littlejohn, M. Grassi, D. E. Jaffe, Miao He, E. Naumova, D. A. Dwyer, B. Z. Hu, Haoqi Lu, T. J. Langford, Ruhui Li, Yaoyu Zhang, Y. B. Huang, Vitalii Zavadskyi, Y. F. Wang, Y. H. Chang, Vit Vorobel, S. Zhang, Jing Wang, T. Hu, Xiaolu Ji, Wei Li, H. M. Steiner, R. W. Hackenburg, Y. Q. Ma, Z. Wang, Honghan Gong, K. Whisnant, Zhiyong Zhang, J. Cheng, Yuhang Guo, B. Roskovec, Jiaheng Zou, D. M. Xia, F. S. Deng, Bing-Lin Young, Liangjian Wen, Guofu Cao, X. C. Ruan, Z. K. Cheng, Z. P. Zhang, Jianmin Li, Y. Y. Ding, Fengpeng An, Zhangquan Xie, Qingmin Zhang, Jim Napolitano, W. Wang, Y. B. Hsiung, Z. Y. Yu, M. V. Diwan, X. Q. Li, H. K. Xu, Patrick Huber, Tadeas Dohnal, J. L. Sun, X. T. Zhang, J. Park, T. M. T. Nguyen, J. H. C. Lee, Z. B. Li, Shengxin Lin, E. T. Worcester, Lin Yang, F. Z. Qi, Jinmei Liu, Jing Zhao, X. Y. Ma, Christopher L. Marshall, J. F. Chang, X. H. Guo, Jiawen Zhang, M. Dvořák, C. H. Wang, R. G. Wang, Feiyang Zhang, Liang Zhan, Christopher G. White, C. Lu, J. L. Xu, Shanfeng Li, Guey-Lin Lin, Jian Liu, J. K. C. Leung, S. H. Kettell, X. B. Ma, Maxim Gonchar, Xinglong Li, and R. A. Johnson

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Fissile material, 010308 nuclear & particles physics, Fission, Detector, FOS: Physical sciences, Astronomy and Astrophysics, 01 natural sciences, Spectral line, Physics::Geophysics, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Inverse beta decay, 0103 physical sciences, Energy spectrum, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Instrumentation, Energy (signal processing)
Abstract

The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era. The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment, in combination with the fission rates of fissile isotopes in the reactor, is used to extract the positron energy spectra resulting from the fission of specific isotopes. This information can be used to produce a precise, data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya Bay. The positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding method. Consistent results are obtained with other unfolding methods. A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and investigated. Given the reactor fission fractions, the technique can predict the energy spectrum to a 2% precision. In addition, we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method., 22 pages, 10 figures, 6 supplemental materials

Published
2021

3. Study of the wave packet treatment of neutrino oscillation at Daya Bay

Author

Ya Ping Cheng, Jie Ren, David E. Jaffe, Xin Qian, Ze Yuan Yu, Qiu Mei Ma, Ji Liang Sun, Christopher G. White, Zhe Ning, Yufeng Li, Wenju Huo, Jia Jie Ling, Meng Ting Yang, Simon Blyth, Ming Chung Chu, Han Yu Wei, Zhi-zhong Xing, Rupert Leitner, Ya Yun Ding, Chang Gen Yang, T. Wise, N. Raper, Simon John Patton, Qiu Ju Li, Jun Cao, Akif Baha Balantekin, Shao Min Chen, S. Jetter, Yu-Cheng Lin, John Kon Chong Leung, Jia Heng Zou, Qun Wu, M. Bishai, Yi Ming Zhang, Yue Kun Heng, William R Edwards, Xiao Lu Ji, Min Fang Yeh, Zhe Wang, Zhaokan Cheng, Hao Liang, Jason C.S. Pun, Ka Vang Tsang, Sam Kohn, Zheng Wang, Wei Wang, Dmitry V. Naumov, Yat Long Chan, Xiang Pan Ji, Yasuhiro Nakajima, de Arcos Jose, Xuantong Zhang, Yu Qian Ma, L. Whitehead, Meng Yun Guan, W. Tang, Yun Chang, Jia Hua Cheng, Vit Vorobel, Zhipeng Lv, Jim Napolitano, Jason Dove, Kin Keung Kwan, Xiao Yan Ma, Yi Xin Zhang, W. J. Wu, Tao Hu, Alexander Olshevskiy, Bing Lin Young, Xi Wang, R. D. McKeown, Zhijian Zhang, Zhimin Wang, J. Joshi, Herbert M Steiner, H. R. Pan, Jia Shu Lu, Ronald Gill, Richard Rosero, K. Treskov, Sheng Chao Li, Yi Fang Wang, Gao Song Li, Chang Guo Lu, Chia-Hao Wu, Ghulam Hussain, Maxim Gonchar, Xing Tao Huang, Hui Gong, Nan Zhou, Zhiyong Zhang, Jian Yi Xu, Han Xiong Huang, Randy Allan Johnson, P. Jaffke, Bedrich Roskovec, David A Martinez Caicedo, D. W. Liu, Li Kang, Tao Xue, B. Viren, Yee Bob Hsiung, Wen Qiang Gu, Shan Zeng, Ran Han, Fei Li, Maria Dolgareva, Jin Fan Chang, Juan Pedro Ochoa-Ricoux, H. H. Zhang, C. E. Tull, M. V. Diwan, H. R. Band, V. Pec, Shanfeng Li, Ziyi Guo, E. T. Worcester, Dong Mei Xia, Zi Ping Zhang, Yu Chen, Wei Hu, Jen-Chieh Peng, M. H. Ye, S. Hans, Ming Qi, Rui Guang Wang, Ian Mitchell, Rui Ting Lei, Deng Jie Li, Meng Wang, Qing Wang Zhao, Kam Biu Luk, Shih Kai Lin, Artem Chukanov, Wei Li Zhong, Chan Fai Wong, He Sheng Chen, Kou Lun Jen, Lawrence Pinsky, Chao Li, Jing Kai Xia, Nai Yan Wang, Michael Mooney, T. Kwok, Guey-Lin Lin, Xue Feng Ding, B. R. Littlejohn, Jia Wen Zhang, Aaron Higuera, Qing Min Zhang, Z. B. Li, Jian Bin Jiao, Jongmin Lee, Marco Grassi, Dmitriy Taychenachev, Miao He, Jiang Lai Liu, Lei Guo, Man-wai Kwok, Hong Lin Zhuang, Jie Cheng, Chao Zhang, Jenny Hc Lee, En Chuan Huang, Yury Malyshkin, Xin Heng Guo, JohnP Cummings, Feng Peng An, Nicolás Viaux, Lei Yang, Jonathan M. Link, K. M. Heeger, JeffJ Cherwinka, Quan You Chen, Joseph Yuen-Keung Hor, Yumei Zhang, S H Kettell, Hao Qi Lu, K. Whisnant, Bei Zhen Hu, Cheng-Ju Stephen Lin, Guang Hua Gong, Matt Kramer, Jimmy Ngai, E. Naumova, D. A. Dwyer, T. J. Langford, Jaewon Park, Xu Bo Ma, Jin Chang Liu, Liangjian Wen, Guofu Cao, Cen Wuron, Gong Xing Sun, Zi Yan Deng, Jie Zhao, Chung Hsiang Wang, Y. Xu, Hin-Lok Henoch Wong, De Wen Cao, R. W. Hackenburg, Weidong Li, Xi Chao Ruan, Fa Zhi Qi, Liang Zhan, Patrick Huber, Shengxin Lin, Li Zhou, Changwei Loh, Ji Lei Xu, Li Chu Chang, Yu Bin Zhao, Zi Ping Ye, Kwong Lau, L. S. Littenberg, Yi Chen, Hai Bo Yang, Ma Sheng Yang, X. N. Li, and L. Lebanowski

Subjects
Physics and Astronomy (miscellaneous), Plane wave, FOS: Physical sciences, lcsh:Astrophysics, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, lcsh:QB460-466, Nuclear, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Dispersion (water waves), Neutrino oscillation, Engineering (miscellaneous), Physics, Quantum Physics, hep-ex, 010308 nuclear & particles physics, Oscillation, Detector, Molecular, hep-ph, Nuclear & Particles Physics, High Energy Physics - Phenomenology, lcsh:QC770-798, High Energy Physics::Experiment, Neutrino, Energy (signal processing)
Abstract

The disappearance of reactor $$\bar{\nu }_e$$ ν ¯ e observed by the Daya Bay experiment is examined in the framework of a model in which the neutrino is described by a wave packet with a relative intrinsic momentum dispersion $$\sigma _\mathrm{{rel}}$$ σ rel . Three pairs of nuclear reactors and eight antineutrino detectors, each with good energy resolution, distributed among three experimental halls, supply a high-statistics sample of $$\bar{\nu }_e$$ ν ¯ e acquired at nine different baselines. This provides a unique platform to test the effects which arise from the wave packet treatment of neutrino oscillation. The modified survival probability formula was used to fit Daya Bay data, providing the first experimental limits: $$2.38 \times 10^{-17}< \sigma _\mathrm{{rel}} < 0.23$$ 2.38 × 10 - 17 < σ rel < 0.23 . Treating the dimensions of the reactor cores and detectors as constraints, the limits are improved: $$10^{-14} \lesssim \sigma _\text {rel} < 0.23$$ 10 - 14 ≲ σ rel < 0.23 , and an upper limit of $$\sigma _\text {rel}

Published
2017
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4. Improved measurement of the reactor antineutrino flux at Daya Bay

Author

Yinhong Zhang, J. P. Cummings, Z. Guo, X. L. Ji, H. S. Chen, K. T. McDonald, H. Y. Wei, F. S. Deng, Christopher L. Marshall, J. F. Chang, Jing Wang, S. K. Lin, F. Li, Z. K. Cheng, Z. P. Zhang, Y. Malyshkin, Liangjian Wen, Guofu Cao, Bing-Lin Young, W. H. Tse, C. Lu, T. Wise, M. Qi, J. J. Cherwinka, Li Zhou, Lin Yang, N. Raper, Jinmei Liu, Jing Zhao, S. Li, Jianglai Liu, X. Y. Ma, Yang Yang, H. R. Band, I. Mitchell, Yi Chen, Artem Chukanov, Michael Kramer, K. M. Heeger, Y. Chang, B. Z. Hu, Lawrence Pinsky, Chun S. J. Pun, Zhuojun Hu, Chang-Wei Loh, L. Mora Lepin, S. Kohn, Shanfeng Li, C. Li, H. Liang, Yixue Chen, S. J. Patton, Hongliang Li, L. Lebanowski, Y. Y. Ding, W. R. Edwards, Shaomin Chen, Jun Cao, Xiao-yan Li, A. Higuera, C. G. Yang, E. Naumova, D. A. Dwyer, W. Wang, J. M. Link, T. J. Langford, H. L. Zhuang, Rupert Leitner, Zhi-zhong Xing, Christopher G. White, Jinjuan Ren, Y. C. Lin, T. Hu, S. F. Li, Q. J. Li, Y. L. Chan, L. W. Koerner, H. M. Steiner, X.F. Zhang, X. Wang, M. Ye, Dmitry V. Naumov, Y. B. Hsiung, M. T. Yang, Haoqi Lu, Minfang Yeh, Y. F. Wang, Y. Q. Ma, M. V. Diwan, Honghan Gong, D. C. Jones, R. M. Qiu, X. Q. Li, Haijun Yang, Baobiao Yue, J. Park, B. R. Littlejohn, W. J. Wu, D. A. Martinez Caicedo, W. Gu, Jia Xu, Yufeng Li, K. L. Jen, Yuhang Guo, Siew Cheng Wong, A. B. Balantekin, R. D. McKeown, R. G. Wang, Jiaheng Zou, Z. M. Wang, Wenju Huo, N. Y. Wang, Liang Zhan, B. Viren, Patrick Huber, Yaoyu Zhang, Y. B. Huang, X. T. Zhang, Juan Pedro Ochoa-Ricoux, Shengxin Lin, Miao He, Yunzhe Liu, S. H. Kettell, X. B. Ma, Richard Rosero, Simon Blyth, M. Z. Wang, Ming Chung Chu, Maxim Gonchar, L. H. Wei, G. Hussain, R. A. Johnson, Yang Liu, Rui Zhang, Jiawen Zhang, J. H. C. Lee, Hongzhao Yu, Hanxiong Huang, L. Kang, K. Whisnant, Guey-Lin Lin, Jonathan S. Lu, J. Cheng, J. K. C. Leung, Chunjie Wang, Z. Y. Yu, R. W. Hackenburg, L. Guo, Qinglong Wu, Kam Biu Luk, H. H. Zhang, Tian Xue, Z. Wang, Chao Zhang, Y. K. Heng, Zhibing Li, Jen-Chieh Peng, H. R. Pan, J. Dove, X. C. Ruan, Guanghua Gong, C. E. Tull, Chi Lin, D. Adey, Xiaohui Qian, J. Lee, S. Zeng, M. Dolgareva, H. L. H. Wong, J. L. Sun, E. T. Worcester, F. Z. Qi, Xiaolu Ji, B. Roskovec, D. M. Xia, X. H. Guo, P. Zheng, Feiyang Zhang, Qingmin Zhang, D. Cao, R. T. Lei, D. E. Jaffe, Alexander Olshevskiy, Jim Napolitano, J. J. Ling, Zhijian Zhang, K. Treskov, F. P. An, Y. X. Zhang, C. C. Zhang, Xingtao Huang, M. Bishai, L. S. Littenberg, V. Pec, S. Hans, Mengsu Yang, Vit Vorobel, Wei Li, and Zhiyong Zhang

Subjects
Physics, Physics - Instrumentation and Detectors, hep-ex, 010308 nuclear & particles physics, Fission, Daya bay, Astrophysics::High Energy Astrophysical Phenomena, Analytical chemistry, FOS: Physical sciences, Flux, Instrumentation and Detectors (physics.ins-det), Detailed data, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Yield ratio, Neutron, High Energy Physics::Experiment, 010306 general physics, physics.ins-det
Abstract

This work reports a precise measurement of the reactor antineutrino flux using 2.2 million inverse beta decay (IBD) events collected with the Daya Bay near detectors in 1230 days. The dominant uncertainty on the neutron detection efficiency is reduced by 56% with respect to the previous measurement through a comprehensive neutron calibration and detailed data and simulation analysis. The new average IBD yield is determined to be $(5.91\pm0.09)\times10^{-43}~\rm{cm}^2/\rm{fission}$ with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes $^{235}$U, $^{238}$U, $^{239}$Pu, and $^{241}$Pu are 0.564, 0.076, 0.304, and 0.056, respectively. The ratio of measured to predicted antineutrino yield is found to be $0.952\pm0.014\pm0.023$ ($1.001\pm0.015\pm0.027$) for the Huber-Mueller (ILL-Vogel) model, where the first and second uncertainty are experimental and theoretical model uncertainty, respectively. This measurement confirms the discrepancy between the world average of reactor antineutrino flux and the Huber-Mueller model., 10 pages, 9 figures, and 2 tables

Published
2019

5. Measurement of the Electron Antineutrino Oscillation with 1958 Days of Operation at Daya Bay

Author

Hongzhao Yu, Hanxiong Huang, L. Kang, J. K. C. Leung, Yanchu Wang, Li Zhou, Alexander Olshevskiy, D. Cao, S. H. Kettell, Miao He, J. J. Ling, S. J. Patton, D. E. Jaffe, Christopher G. White, X. B. Ma, Xingtao Huang, M. Bishai, Jinjuan Ren, Y. L. Chan, H. R. Band, H. Liang, Yixue Chen, H. L. Zhuang, S. Kohn, E. T. Worcester, M. Ye, Wenxiao Wang, Haifeng Li, F. Z. Qi, Jen-Chieh Peng, L. S. Littenberg, Juan Pedro Ochoa-Ricoux, T. Wise, Maxim Gonchar, Yanping Huang, R. T. Lei, Y. C. Lin, W. R. Edwards, D. Taychenachev, R. A. Johnson, G. Hussain, X. L. Ji, V. Vorobel, Jianrun Hu, Patrick Huber, X. Wang, Qingmin Zhang, Jiawen Zhang, Quanyin Li, Yinhong Zhang, Minfang Yeh, Chang-Wei Loh, B. R. Littlejohn, Xiaolu Ji, D. M. Xia, H. Y. Wei, F. S. Deng, X. T. Zhang, Z. Guo, B. Roskovec, R. Zhang, L. Lebanowski, Y. Y. Ding, Shengxin Lin, Z. K. Cheng, Z. P. Zhang, Jianglai Liu, Bing-Lin Young, Xiaohui Qian, D. Adey, Jim Napolitano, J. Lee, Honghan Gong, Yaoyu Zhang, Yang Yang, D. A. Martinez Caicedo, S. Zeng, M. Dolgareva, Michael Kramer, L. Mora Lepin, Y. H. Chang, E. Naumova, D. A. Dwyer, K. T. McDonald, H. L. H. Wong, T. J. Langford, Guey-Lin Lin, Jonathan S. Lu, Baobiao Yue, X.F. Zhang, Xiao-yan Li, A. Higuera, Zhi-zhong Xing, C. H. Wang, H. M. Steiner, X. C. Ruan, Huijun Zhang, P. Zheng, Feiyang Zhang, Haijun Yang, L. Guo, R. G. Wang, M. Qi, W. J. Wu, Siew Cheng Wong, R. D. McKeown, Ye Chen, Chao Zhang, J. Park, Liang Zhan, Changjian Lin, Yang Heng, Jiaheng Zou, Mengsu Yang, Haonan Lu, Shanfeng Li, H. R. Pan, T. Hu, Xiaohu Guo, M. T. Yang, J. H. C. Lee, B. Z. Hu, F. Li, Yunzhe Liu, C. E. Tull, W. H. Tse, Christopher L. Marshall, J. F. Chang, W. Gu, Z. Y. Yu, D. C. Jones, Zhibing Li, Yufeng Li, J. M. Link, J. P. Cummings, A. B. Balantekin, Rupert Leitner, Changgen Yang, K. M. Heeger, K. L. Jen, Jing Wang, C. Lu, J. L. Xu, Wenju Huo, S. K. Lin, Y. Malyshkin, Liangjian Wen, Guofu Cao, Qinglong Wu, Kam Biu Luk, Chun S. J. Pun, Artem Chukanov, Lawrence Pinsky, Zhuojun Hu, Shaomin Chen, Jun Cao, J. L. Sun, S. F. Li, Tian Xue, Y. X. Zhang, Simon Blyth, Dmitry V. Naumov, M. Z. Wang, Ming Chung Chu, C. Li, Richard Rosero, W. Tang, N. Y. Wang, B. Viren, L. H. Wei, Z. M. Wang, Yanhui Ma, K. Whisnant, J. Cheng, Yanlin Liu, Wei Li, Zhijian Zhang, K. Treskov, Zhiyong Zhang, F. P. An, C. C. Zhang, Hucheng Chen, V. Pec, S. Hans, R. W. Hackenburg, Z. Wang, Guanghua Gong, J. J. Cherwinka, N. Raper, L. W. Koerner, Yicheng Guo, Y. B. Hsiung, M. V. Diwan, R. M. Qiu, X. Q. Li, Lin Yang, Jinmei Liu, Jing Zhao, S. Li, X. Y. Ma, and I. Mitchell

Subjects
Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Oscillation, hep-ex, Daya bay, General Physics and Astronomy, Inverse, FOS: Physical sciences, Daya Bay Reactor Neutrino Experiment, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Spectral line, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Electron neutrino, physics.ins-det, Energy (signal processing)
Abstract

We report a measurement of electron antineutrino oscillation from the Daya Bay Reactor Neutrino Experiment with nearly 4 million reactor $\overline{\nu}_{e}$ inverse beta decay candidates observed over 1958 days of data collection. The installation of a Flash-ADC readout system and a special calibration campaign using different source enclosures reduce uncertainties in the absolute energy calibration to less than 0.5% for visible energies larger than 2 MeV. The uncertainty in the cosmogenic $^9$Li and $^8$He background is reduced from 45% to 30% in the near detectors. A detailed investigation of the spent nuclear fuel history improves its uncertainty from 100% to 30%. Analysis of the relative $\overline{\nu}_{e}$ rates and energy spectra among detectors yields $\sin^{2}2\theta_{13} = 0.0856\pm 0.0029$ and $\Delta m^2_{32}=(2.471^{+0.068}_{-0.070})\times 10^{-3}~\mathrm{eV}^2$ assuming the normal hierarchy, and $\Delta m^2_{32}=-(2.575^{+0.068}_{-0.070})\times 10^{-3}~\mathrm{eV}^2$ assuming the inverted hierarchy., Comment: 6 pages, 4 figures, and 1 table. v4: the published version

Published
2018

6. Seasonal variation of the underground cosmic muon flux observed at Daya Bay

Author

T. J. Langford, K. V. Tsang, H. M. Steiner, Y. Q. Ma, Artem Chukanov, Lawrence Pinsky, Michael Kramer, J. J. Cherwinka, Patrick Huber, S. J. Patton, W. Q. Gu, X. T. Zhang, Qinglong Wu, S. H. Kettell, X. B. Ma, Shengxin Lin, A. Khan, Tian Xue, W. J. Wu, Chang-Wei Loh, R. D. McKeown, Xiaohu Guo, Richard Rosero, L. Lebanowski, H. L. Zhuang, Y. K. Heng, Y. Y. Ding, M. Ye, T. Wise, J. F. Chang, M. Qi, Alexander Olshevskiy, M. T. Yang, Maxim Gonchar, D. C. Jones, D. Taychenachev, S. Hans, Changgen Yang, K. Whisnant, J. Cheng, E. T. Worcester, Y. Xu, E. C. Huang, A. B. Balantekin, G. Hussain, Y. Nakajima, H. S. Chen, C. Li, W. Tang, K. K. Kwan, Y. L. Chan, F. Z. Qi, Chun S. J. Pun, R. A. Johnson, M. W. Kwok, N. Y. Wang, C. Lu, B. Viren, J. J. Ling, Shaomin Chen, Jun Cao, N. Viaux, J. L. Xu, X. L. Ji, Christopher G. White, B. Z. Hu, Xin Qian, Jiawen Zhang, H. H. Zhang, Minfang Yeh, J. B. Jiao, Vit Vorobel, S. F. Li, W. R. Edwards, Guisen Li, Honghan Gong, Rupert Leitner, Zhijian Zhang, Z. Guo, Dmitry V. Naumov, H. R. Band, C. H. Wang, R. T. Lei, Hanxiong Huang, L. Kang, Xingtao Huang, Yang Yang, Y. C. Lin, B. Roskovec, Xiao-yan Li, K. Treskov, Wei Li, A. Higuera, S. Zeng, J. Park, Jen-Chieh Peng, Siew Cheng Wong, L. H. Whitehead, Zhi-zhong Xing, Z. Y. Yu, X. Wang, Li Zhou, H. Y. Wei, F. P. An, Wenju Huo, Yicheng Guo, K. T. McDonald, Haoqi Lu, H. Liang, Yixue Chen, Jiaheng Zou, Jinjuan Ren, D. A. Martinez Caicedo, M. Bishai, J. H. C. Lee, Haijun Yang, Q. J. Li, Dejun Li, Y. F. Wang, Yi Chen, Y. B. Hsiung, Shanfeng Li, Bing-Lin Young, J. Dove, B. R. Littlejohn, Wei Wang, C. C. Zhang, C. H. Wu, M. V. Diwan, L. S. Littenberg, R. M. Qiu, X. Q. Li, T. Kwok, Guey-Lin Lin, R. W. Hackenburg, R. G. Wang, Z. Wang, Simon Blyth, M. Z. Wang, Ming Chung Chu, Yufeng Li, K. L. Jen, N. Raper, Jonathan S. Lu, Z. Ye, Liang Zhan, Marco Grassi, Miao He, Y. X. Zhang, X. C. Ruan, Kam-Biu Luk, S. K. Lin, L. Guo, Y. H. Chang, F. Li, H. R. Pan, D. M. Xia, Chao Zhang, Z. B. Li, Zhiyong Zhang, S. Jetter, Y. Malyshkin, J. L. Sun, Lin Yang, Z. M. Wang, Jinmei Liu, C. Sebastiani, Liangjian Wen, Jing Zhao, X. Y. Ma, Guofu Cao, I. Mitchell, Jianglai Liu, S. Kohn, D. Cao, Guanghua Gong, C. E. Tull, Z. K. Cheng, Z. P. Zhang, D. E. Jaffe, Chi Lin, Juan Pedro Ochoa-Ricoux, Qingmin Zhang, Q. Y. Chen, Jim Napolitano, Y. M. Zhang, J. M. Link, J. P. Cummings, J. Lee, M. Dolgareva, H. L. H. Wong, Kwong Lau, K. M. Heeger, V. Pec, X. P. Ji, Mengsu Yang, J. K. Xia, T. Hu, H. Y. Ngai, R. L. Gill, E. Naumova, and D. A. Dwyer

Subjects
Physics - Instrumentation and Detectors, Correlation coefficient, Physics::Instrumentation and Detectors, cosmic ray experiments, neutrino detectors, neutrino experiments, Flux, FOS: Physical sciences, Atmospheric sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, medicine, 010306 general physics, Physics, COSMIC cancer database, Muon, 010308 nuclear & particles physics, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Seasonality, Atmospheric temperature, medicine.disease, Overburden, Neutrino detector, High Energy Physics::Experiment
Abstract

The Daya Bay Experiment consists of eight identically designed detectors located in three underground experimental halls named as EH1, EH2, EH3, with 250, 265 and 860 meters of water equivalent vertical overburden, respectively. Cosmic muon events have been recorded over a two-year period. The underground muon rate is observed to be positively correlated with the effective atmospheric temperature and to follow a seasonal modulation pattern. The correlation coefficient $\alpha$, describing how a variation in the muon rate relates to a variation in the effective atmospheric temperature, is found to be $\alpha_{\text{EH1}} = 0.362\pm0.031$, $\alpha_{\text{EH2}} = 0.433\pm0.038$ and $\alpha_{\text{EH3}} = 0.641\pm0.057$ for each experimental hall., Comment: Updated to be identical to the published version

Published
2018

7. Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

Author

P. Jaffke, Y. K. Hor, L. Guo, H. H. Zhang, J. Lee, F. Li, Chao Zhang, S. Zeng, M. Dolgareva, Jen-Chieh Peng, C. Li, H. L. H. Wong, Y. X. Zhang, Marco Grassi, Miao He, J. Dove, J. P. Cummings, S. H. Kettell, X. B. Ma, J. J. Cherwinka, Z. M. Wang, S. J. Patton, W. Q. Gu, X. P. Ji, X. C. Ruan, J. B. Jiao, J. Joshi, Z. Guo, Michael Kramer, Chun S. J. Pun, Hanxiong Huang, L. Kang, Yi-Fang Zhao, Maxim Gonchar, K. M. Heeger, W. Tang, H. L. Zhuang, M. V. Diwan, Haosheng Chen, Shaomin Chen, Jun Cao, Rupert Leitner, K. T. McDonald, J. M. Link, S. K. Lin, R. A. Johnson, N. Y. Wang, M. Qi, Vit Vorobel, S. F. Li, C. H. Wu, W. J. Wu, Changgen Yang, Changjian Lin, B. Viren, Richard Rosero, R. D. McKeown, J. K. Xia, Jiawen Zhang, Yanchu Wang, Y. Malyshkin, Dmitry V. Naumov, R. T. Lei, H. R. Band, D. C. Jones, Wei Li, A. B. Balantekin, Kwong Lau, X. L. Ji, C. Lu, J. L. Xu, H. Y. Ngai, R. L. Gill, Meng Wang, H. Liang, Yixue Chen, G. X. Sun, N. Viaux, Liangjian Wen, Y. C. Lin, Guofu Cao, H. Y. Wei, T. Hu, Y. L. Chan, Mengsu Yang, Bing-Lin Young, Haijun Yang, X. Wang, M. Mooney, W. R. Cen, Xingtao Huang, D. W. Liu, Minfang Yeh, T. Kwok, M. Bishai, Qinglong Wu, Kam Biu Luk, D. M. Xia, Zhiyong Zhang, Haoqi Lu, Dejun Li, Guey-Lin Lin, Y. Nakajima, Jonathan S. Lu, Z. Ye, H. R. Pan, L. S. Littenberg, L. H. Whitehead, Yi Chen, Chunjie Wang, N. Raper, Tian Xue, J. H. Cheng, M. W. Kwok, E. Naumova, D. A. Dwyer, B. Roskovec, Zhi Ning, Y. Chang, Q. J. Li, Xiaohu Guo, M. T. Yang, Chang-Wei Loh, Xuefeng Ding, T. J. Langford, Y. K. Heng, Mengyun Guan, K. V. Tsang, Yufeng Li, K. L. Jen, Li Zhou, B. R. Littlejohn, C. E. Tull, Shanfeng Li, H. M. Steiner, L. Lebanowski, Y. Y. Ding, Z. K. Cheng, D. Cao, Y. Q. Ma, Z. P. Zhang, Zhijian Zhang, M. Ye, K. Whisnant, J. Cheng, Artem Chukanov, Juan Pedro Ochoa-Ricoux, Nan Zhou, Zhibing Li, K. Treskov, D. Taychenachev, Alexander Olshevskiy, Lawrence Pinsky, K. K. Kwan, G. Hussain, R. P. Guo, Y. Xu, E. C. Huang, Yaping Cheng, Qingmin Zhang, V. Pec, J. J. Ling, Q. W. Zhao, Q. Y. Chen, S. Hans, B. Z. Hu, Guisen Li, Jim Napolitano, Li Chang, W. L. Zhong, F. P. An, Honghan Gong, Qingming Ma, Siew Cheng Wong, W. R. Edwards, Y. B. Hsiung, Ran Han, Jiaheng Zou, Lin Yang, Jinmei Liu, Jing Zhao, X. Y. Ma, J. Y. Xu, I. Mitchell, S. Jetter, Wenju Huo, Simon Blyth, Ming Chung Chu, W. Hu, Zeyuan Yu, Xin Qian, S. Kohn, Xiao-yan Li, A. Higuera, Zhi-zhong Xing, Ziyan Deng, Jianglai Liu, Jinjuan Ren, W. H. Wang, R. W. Hackenburg, Z. Wang, Guanghua Gong, Y. M. Zhang, D. E. Jaffe, T. Wise, Patrick Huber, J. F. Chang, X. T. Zhang, Shengxin Lin, D. A. Martinez Caicedo, J. L. Sun, R. G. Wang, J. Park, J. H. C. Lee, Liang Zhan, E. T. Worcester, Z. Lv, F. Z. Qi, J. de Arcos, and Christopher G. White

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Daya bay, energy spectrum, Flux, FOS: Physical sciences, Daya Bay Reactor Neutrino Experiment, antineutrino flux, Daya Bay, reactor, 01 natural sciences, High Energy Physics - Experiment, Positron energy, Physics::Geophysics, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Energy spectrum, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Inverse beta decay, High Energy Physics::Experiment
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 (560~m and 600~m flux-weighted baselines) and one far (1640~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., Comment: version published in Chinese Physics C

Published
2017

8. Estimation of cotton yield based on weather parameters of Banaskantha district in Gujarat state

Author

N. J. RANKJA, S. M. UPADHYAY, H. R. PANDYA, B. A. PARMAR, and S. L. VARMORA

Subjects
Cotton, prediction equation, forecasting, weather variables, Agriculture
Abstract

The present investigation was undertaken to identify the quantitative relationship between weather parameters and district level yield of cotton and to develop preharvest forecast models for cotton yield. For this purpose 32 years weather and crop yield records of Banaskantha district were collected. It was found that the 26 week crop period model ( using original weather variables, week wise approach) was recommended for pre harvest forecast due to higher R2 value and lower simulated forecast error. The time trend, maximum temperature, morning and evening relative humidity have significantly affected on crop yield.

Published
2010
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