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Measurement of the response of a Ga solar neutrino experiment to neutrinos from an 37Ar source

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arxiv nucl-ex/0512041 v1 pith:UQPBUO33 submitted 2005-12-25 nucl-ex

Measurement of the response of a Ga solar neutrino experiment to neutrinos from an 37Ar source

J.N. Abdurashitov , V.N. Gavrin , S.V. Girin , V.V. Gorbachev , P.P. Gurkina , T.V. Ibragimova , A.V. Kalikhov , N.G. Khairnasov
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T.V. Knodel V.A. Matveev I.N. Mirmov A.A. Shikhin E.P. Veretenkin V.M. Vermul V.E. Yants G.T. Zatsepin T.J. Bowles S.R. Elliott W.A. Teasdale B.T. Cleveland W.C. Haxton J.F. Wilkerson J.S. Nico A. Suzuki K. Lande Yu.S. Khomyakov V.M. Poplavsky V.V. Popov O.V. Mishin A.N. Petrov B.A. Vasiliev S.A. Voronov A.I. Karpenko V.V. Maltsev N.N. Oshkanov A.M. Tuchkov V.I. Barsanov A.A. Janelidze A.V. Korenkova N.A. Kotelnikov S.Yu. Markov V.V. Selin Z.N. Shakirov A.A. Zamyatina S.B. Zlokazov
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An intense source of 37Ar was produced by the (n,alpha) reaction on 40Ca by irradiating 330 kg of calcium oxide in the fast neutron breeder reactor at Zarechny, Russia. The 37Ar was released from the solid target by dissolution in acid, collected from this solution, purified, sealed into a small source, and brought to the Baksan Neutrino Observatory where it was used to irradiate 13 tonnes of gallium metal in the Russian-American gallium solar neutrino experiment SAGE. Ten exposures of the gallium to the source, whose initial strength was 409 +/- 2 kCi, were carried out during the period April to September 2004. The 71Ge produced by the reaction 71Ga(nu_e,e^-)71Ge was extracted, purified, and counted. The measured production rate was 11.0 ^+1.0 _-0.9 (stat) +/- 0.6 (syst) atoms of 71Ge/d, which is 0.79 ^+0.09_-0.10 of the theoretically calculated production rate. When all neutrino source experiments with gallium are considered together, there is an indication the theoretical cross section has been overestimated.

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    Updated nuclear calculations lower the gallium anomaly significance to 2.3σ.