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Title: Search of neutrino magnetic moments with a high-purity germanium detector at the Kuo-Sheng nuclear power station

Abstract

A search of neutrino magnetic moments was carried out at the Kuo-Sheng nuclear power station at a distance of 28 m from the 2.9 GW reactor core. With a high purity germanium detector of mass 1.06 kg surrounded by scintillating NaI(Tl) and CsI(Tl) crystals as anti-Compton detectors, a detection threshold of 5 keV and a background level of 1 kg{sup -1} keV{sup -1} day{sup -1} near threshold were achieved. Details of the reactor neutrino source, experimental hardware, background understanding, and analysis methods are presented. Based on 570.7 and 127.8 days of Reactor ON and OFF data, respectively, at an average Reactor ON electron antineutrino flux of 6.4x10{sup 12} cm{sup -2} s{sup -1}, the limit on the neutrino magnetic moments of {mu}{sub {nu}{sub e}}<7.4x10{sup -11}{mu}{sub B} at 90% confidence level was derived. Indirect bounds on the {nu}{sub e} radiative decay lifetimes were inferred.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ;  [1];  [2];  [1];  [3];  [1];  [4];  [1] more »;  [5]; ;  [6];  [7] « less
  1. Institute of Physics, Academia Sinica, Taipei 115, Taiwan (China)
  2. (China)
  3. (India)
  4. (United States)
  5. (Turkey)
  6. Kuo-Sheng Nuclear Power Station, Taiwan Power Company, Kuo-Sheng 207, Taiwan (China)
  7. Institute of Nuclear Energy Research, Lung-Tan 325, Taiwan (China) (and others)
Publication Date:
OSTI Identifier:
20935186
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.012001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CESIUM IODIDES; CRYSTALS; ELECTRON ANTINEUTRINOS; GE SEMICONDUCTOR DETECTORS; KEV RANGE 01-10; KUOSHENG-1 REACTOR; LIFETIME; MAGNETIC MOMENTS; MASS; RADIATIVE DECAY; REACTOR CORES; SODIUM IODIDES; THALLIUM

Citation Formats

Wong, H. T., Li, H. B., Lee, F. S., Wu, S. C., Chen, C. P., Chou, M. H., Jon, G. C., Lai, W. P., Lee, S. C., Lin, F. K., Lin, S. K., Lin, S. T., Chang, H. M., Liao, H. Y., Department of Physics, National Taiwan University, Taipei 106, Taiwan, Singh, V., Department of Physics, Banaras Hindu University, Varanasi 221005, Chang, C. Y., Department of Physics, University of Maryland, College Park Maryland 20742, Deniz, M., Department of Physics, Middle East Technical University, Ankara 06531, Fang, J. M., Su, R. F., and Hu, C. H. Search of neutrino magnetic moments with a high-purity germanium detector at the Kuo-Sheng nuclear power station. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.012001.
Wong, H. T., Li, H. B., Lee, F. S., Wu, S. C., Chen, C. P., Chou, M. H., Jon, G. C., Lai, W. P., Lee, S. C., Lin, F. K., Lin, S. K., Lin, S. T., Chang, H. M., Liao, H. Y., Department of Physics, National Taiwan University, Taipei 106, Taiwan, Singh, V., Department of Physics, Banaras Hindu University, Varanasi 221005, Chang, C. Y., Department of Physics, University of Maryland, College Park Maryland 20742, Deniz, M., Department of Physics, Middle East Technical University, Ankara 06531, Fang, J. M., Su, R. F., & Hu, C. H. Search of neutrino magnetic moments with a high-purity germanium detector at the Kuo-Sheng nuclear power station. United States. doi:10.1103/PHYSREVD.75.012001.
Wong, H. T., Li, H. B., Lee, F. S., Wu, S. C., Chen, C. P., Chou, M. H., Jon, G. C., Lai, W. P., Lee, S. C., Lin, F. K., Lin, S. K., Lin, S. T., Chang, H. M., Liao, H. Y., Department of Physics, National Taiwan University, Taipei 106, Taiwan, Singh, V., Department of Physics, Banaras Hindu University, Varanasi 221005, Chang, C. Y., Department of Physics, University of Maryland, College Park Maryland 20742, Deniz, M., Department of Physics, Middle East Technical University, Ankara 06531, Fang, J. M., Su, R. F., and Hu, C. H. Mon . "Search of neutrino magnetic moments with a high-purity germanium detector at the Kuo-Sheng nuclear power station". United States. doi:10.1103/PHYSREVD.75.012001.
@article{osti_20935186,
title = {Search of neutrino magnetic moments with a high-purity germanium detector at the Kuo-Sheng nuclear power station},
author = {Wong, H. T. and Li, H. B. and Lee, F. S. and Wu, S. C. and Chen, C. P. and Chou, M. H. and Jon, G. C. and Lai, W. P. and Lee, S. C. and Lin, F. K. and Lin, S. K. and Lin, S. T. and Chang, H. M. and Liao, H. Y. and Department of Physics, National Taiwan University, Taipei 106, Taiwan and Singh, V. and Department of Physics, Banaras Hindu University, Varanasi 221005 and Chang, C. Y. and Department of Physics, University of Maryland, College Park Maryland 20742 and Deniz, M. and Department of Physics, Middle East Technical University, Ankara 06531 and Fang, J. M. and Su, R. F. and Hu, C. H.},
abstractNote = {A search of neutrino magnetic moments was carried out at the Kuo-Sheng nuclear power station at a distance of 28 m from the 2.9 GW reactor core. With a high purity germanium detector of mass 1.06 kg surrounded by scintillating NaI(Tl) and CsI(Tl) crystals as anti-Compton detectors, a detection threshold of 5 keV and a background level of 1 kg{sup -1} keV{sup -1} day{sup -1} near threshold were achieved. Details of the reactor neutrino source, experimental hardware, background understanding, and analysis methods are presented. Based on 570.7 and 127.8 days of Reactor ON and OFF data, respectively, at an average Reactor ON electron antineutrino flux of 6.4x10{sup 12} cm{sup -2} s{sup -1}, the limit on the neutrino magnetic moments of {mu}{sub {nu}{sub e}}<7.4x10{sup -11}{mu}{sub B} at 90% confidence level was derived. Indirect bounds on the {nu}{sub e} radiative decay lifetimes were inferred.},
doi = {10.1103/PHYSREVD.75.012001},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • A search of axions produced in nuclear transitions was performed at the Kuo-Sheng Nuclear Power Station with a high-purity germanium detector of mass 1.06 kg at a distance of 28 m from the 2.9 GW reactor core. The expected experimental signatures were monoenergetic lines produced by their Primakoff or Compton conversions at the detector. Based on 459.0/96.3 days of reactor ON/OFF data, no evidence of axion emissions were observed and constraints on the couplings g{sub a{gamma}}{sub {gamma}} and g{sub aee} versus axion mass m{sub a} within the framework of invisible axion models were placed. The KSVZ and DFSZ models canmore » be excluded for 10{sup 4} eV < or approx. m{sub a} < or approx. 10{sup 6} eV. Model-independent constraints on g{sub a{gamma}}{sub {gamma}}{center_dot}g{sub aNN}{sup 1}<7.7x10{sup -9} GeV{sup -2} for m{sub a} < or approx. 10{sup 5} eV and g{sub aee}{center_dot}g{sub aNN}{sup 1}<1.3x10{sup -10} for m{sub a} < or approx.10{sup 6} eV at 90% confidence level were derived. This experimental approach provides a unique probe for axion mass at the keV-MeV range not accessible to the other techniques.« less
  • Neutrino-electron scatterings are purely leptonic processes with robust standard model (SM) predictions. Their measurements can therefore provide constraints to physics beyond SM. The {nu}{sub e}-e data taken at the Kuo-Sheng Reactor Neutrino Laboratory were used to probe two scenarios: nonstandard neutrino interactions (NSI) and unparticle physics. New constraints were placed on the NSI parameters ({epsilon}{sub ee}{sup eL},{epsilon}{sub ee}{sup eR}), ({epsilon}{sub e{mu}}{sup eL},{epsilon}{sub e{mu}}{sup eR}), and ({epsilon}{sub e{tau}}{sup eL},{epsilon}{sub e{tau}}{sup eR}) for the nonuniversal and flavor-changing channels, respectively, as well as to the coupling constants for scalar ({lambda}{sub 0}) and vector ({lambda}{sub 1}) unparticles to the neutrinos and electrons.
  • The {nu}{sub e}-e{sup -} 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 {nu}{sub e} flux of 6.4x10{sup 12} cm{sup -2} s{sup -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 29882/7369 kg-days of Reactor ON/OFF data, the standard model (SM) electroweak interaction was probed at the squared 4-momentum transfer range of Q{sup 2{approx}}3x10{sup -6} GeV{sup 2}. The ratio of experimental to SM cross sections ofmore » {xi}=[1.08{+-}0.21(stat){+-}0.16(sys)] was measured. Constraints on the electroweak parameters (g{sub V},g{sub A}) were placed, corresponding to a weak mixing angle measurement of sin{sup 2{theta}}{sub W}=0.251{+-}0.031(stat){+-}0.024(sys). Destructive interference in the SM {nu}{sub e}-e process was verified. Bounds on anomalous neutrino electromagnetic properties were placed: neutrino magnetic moment at {mu}{sub {nu}{sub e}}<2.2x10{sup -10} {mu}{sub B} and the neutrino charge radius at -2.1x10{sup -32} cm{sup 2}<<r{sub {nu}}{sub e}{sup 2}><3.3x10{sup -32} cm{sup 2}, both at 90% confidence level.« less
  • A laboratory has been constructed by the TEXONO Collaboration at the Kuo-Sheng Reactor Power Plant in Taiwan to study low energy neutrino physics. A limit on the neutrino magnetic moment of {mu}{nu}({nu}-bare) < 7.2 x 10-11 {mu}B at 90% confidence level has been achieved from measurements with a high-purity germanium detector, as well as the electron neutrinos ({nu}{sub e}) produced from nuclear power reactors has been studied. Other research program at Kuo-Sheng are surveyed.
  • Cited by 2