Measurement of the response of a gallium metal solar neutrino experiment to neutrinos from a 51 Cr source
1999; American Institute of Physics; Volume: 59; Issue: 4 Linguagem: Inglês
10.1103/physrevc.59.2246
ISSN1538-4497
AutoresJ. N. Abdurashitov, В. Н. Гаврин, S. V. Girin, V. V. Gorbachev, Т. В. Ибрагимова, A. V. Kalikhov, N. G. Khairnasov, T. V. Knodel, В. Н. Корноухов, I. N. Mirmov, A. A. Shikhin, E. P. Veretenkin, V. M. Vermul, V. E. Yants, Г. Т. Зацепин, Yu. S. Khomyakov, A. V. Zvonarev, T. J. Bowles, J. S. Nico, W. A. Teasdale, D. L. Wark, M. L. Cherry, V. N. Karaulov, V. L. Levitin, V. I. Maev, P. I. Nazarenko, V. Shkolnik, N. V. Skorikov, B. T. Cleveland, T. Daily, R. Davis, K. Lande, C. K. Lee, P. Wildenhain, S. R. Elliott, J. F. Wilkerson,
Tópico(s)Dark Matter and Cosmic Phenomena
ResumoThe neutrino capture rate measured by the Russian-American Gallium Experiment is well below that predicted by solar models. To check the response of this experiment to low-energy neutrinos, a 517 kCi source of ${}^{51}$Cr was produced by irradiating 512.7 g of 92.4%-enriched ${}^{50}$Cr in a high-flux fast neutron reactor. This source, which mainly emits monoenergetic 747-keV neutrinos, was placed at the center of a 13.1 ton target of liquid gallium and the cross section for the production of ${}^{71}$Ge by the inverse beta decay $\mathrm{reaction}{ }^{71}\mathrm{Ga}({\ensuremath{\nu}}_{e}{,e}^{\ensuremath{-}}{)}^{71}\mathrm{Ge}$ was measured to be $[5.55\ifmmode\pm\else\textpm\fi{}0.60(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.32(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}45}{\mathrm{cm}}^{2}.$ The ratio of this cross section to the theoretical cross section of Bahcall for this reaction is 0.95 \ifmmode\pm\else\textpm\fi{}0.12 ${(\mathrm{expt})}_{\ensuremath{-}0.027}^{+0.035}$ (theor) and to the cross section of Haxton is 0.87\ifmmode\pm\else\textpm\fi{}0.11 (expt)\ifmmode\pm\else\textpm\fi{}0.09 (theor). This good agreement between prediction and observation implies that the overall experimental efficiency is correctly determined and provides considerable evidence for the reliability of the solar neutrino measurement.
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