Measurement of the response of a Ga solar neutrino experiment to 37Ar source |
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| Institution: | (1) Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312, Russia;(2) Institute of Nuclear Materials, Zarechny, 624250, Russia;(3) Los Alamos National Laboratory, Los Alamos, NM 875545, USA;(4) University of Washington, Seattle, WA 98195, USA;(5) Beloyarsk Nuclear Power Plant, Zarechny, 624250, Russia;(6) Institute of Physics and Power Engineering, Obninsk, Kaluga oblast, 249020, Russia;(7) University of Pennsylvania, Philadelphia, PA 19104, USA;(8) OKB Mechanical Engineering, Nizhny Novgorod, 603074, Russia;(9) National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;(10) Tohoku University, Sendai 980-8578, Japan |
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| Abstract: | An intense 37Ar source was produced by the (n, α) 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 t of gallium metal in the Russian—American
solar neutrino experiment SAGE. Ten exposures of the gallium to the source, whose initial strength was ∼ 409 ± 2kCi, were
carried out during the period from April to September 2004. The 71Ge produced by the reaction 71Ga(ν
e, e
−)71Ge was extracted, purified, and counted. The measured production rate was 11.0
−0.9
+1.0
(stat.) ±0.6 (syst.) atoms of 71Ge/d, which is 0.79
−0.10
+0.09
of the theoretically calculated production rate.
The text was submitted by the authors in English. |
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