Measurement of ν̄e-electron scattering cross section with a CsI(Tl) scintillating crystal array at the Kuo-Sheng nuclear power reactor

M. Deniz, S. T. Lin, V. Singh, J. Li, H. T. Wong, S. Bilmis, C. Y. Chang, H. M. Chang, W. C. Chang, C. P. Chen, M. H. Chou, K. J. Dong, J. M. Fang, C. H. Hu, G. C. Jon, W. S. Kuo, W. P. Lai, F. S. Lee, S. C. Lee, H. B. LiH. Y. Liao, C. W. Lin, F. K. Lin, S. K. Lin, Y. Liu, J. F. Qiu, M. Serin, H. Y. Sheng, L. Singh, R. F. Su, W. S. Tong, J. J. Wang, P. L. Wang, S. C. Wu, S. W. Yang, C. X. Yu, Q. Yue, M. Zeyrek, D. X. Zhao, Z. Y. Zhou, Y. F. Zhu, B. A. Zhuang

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Abstract

The ν̄e-e- elastic scattering cross section was measured with a CsI(Tl) scintillating crystal array having a total mass of 187 kg. The detector was exposed to an average reactor ν̄e flux of 6.4×1012cm-2s-1 at the Kuo-Sheng Nuclear Power Station. The experimental design, conceptual merits, detector hardware, data analysis, and background understanding of the experiment are presented. Using 29882/7369kg-days of Reactor ON/OFF data, the standard model (SM) electroweak interaction was probed at the squared 4-momentum transfer range of Q2∼3×10-6GeV2. The ratio of experimental to SM cross sections of ξ=[1.08±0.21(stat)±0.16(sys)] was measured. Constraints on the electroweak parameters (gV,gA) were placed, corresponding to a weak mixing angle measurement of sin∑2θW=0. 251±0.031(stat)±0.024(sys). Destructive interference in the SM ν̄e-e process was verified. Bounds on anomalous neutrino electromagnetic properties were placed: neutrino magnetic moment at μν̄e<2. 2×10-10μB and the neutrino charge radius at -2.1×10-32cm2< rν̄e2 <3.3×10 -32cm2, both at 90% confidence level.

Original languageEnglish
Article number072001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume81
Issue number7
DOIs
StatePublished - 5 Apr 2010

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