Future publications
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TURE PUBLICATIONS
DOI: 10.1134/S1063778806030173
Determination of the Activity of an Artificial Neutrino Source Based on the 37 Ar Isotope D. N. Abdurashitov, E. P. Veretenkin, V. N. Gavrin, V. V. Gorbachev, T. V. Ibragimova, A. V. Kalikhov, I. N. Mirmov, A. A. Shikhin, V. E. Yants, V. I. Barsanov, A. A. Dzhanelidze, S. B. Zlokazov, and S. Yu. Markov
The activity of an intense man-made neutrino source on the basis of the 37 Ar isotope was determined by using a dedicated direct-measurement method based on the use of a proportional counter. The measurements were performed at the Institute for Reactor Materials in Zarechny after the calibration of the radiochemical gallium–germanium neutrino telescope of the Baksan Neutrino Observatory (Institute for Nuclear Research, Russian Academy of Sciences) by using this source. At the time at which the calibration experiment began (04:00, April 30, 2004), the source intensity was 405.9 ± 1.4 kCi.
Artificial Neutrino Source Based on the 37 Ar Isotope V. I. Barsanov, A. A. Dzhanelidze, S. B. Zlokazov, N. A. Kotel’nikov, S. Yu. Markov, V. V. Selin, Z. N. Shakirov, D. N. Abdurashitov, E. P. Veretenkin, V. N. Gavrin, V. V. Gorbachev, T. V. Ibragimova, A. V. Kalikhov, I. N. Mirmov, A. A. Shikhin, V. E. Yants, and Yu. S. Khomyakov
The source in question was produced in April 2004 after 6-month irradiation of a compact calcium oxide target of mass 330 kg by fast neutrons from the BN600 reactor in Zarechny (Russia). The 37 Ar isotope was produced in the (n, α) reaction on 40 Ca. To extract 37 Ar, the solid target was dissolved in an aqueous solution of nitric acid, whereupon the argon was isolated, purified, and placed into a compact capsule. This source was used to calibrate the SAGE gallium–germanium neutrino telescope at the Baksan Neutrino Observatory (Institute of Nuclear Research, Russian Academy of Sciences). The activity of the source was measured by several methods in the process of its production, during the calibration experiment, and after its completion; in all, six methods were employed. The weighted average of the neutrino-source activity according to the results of measurements by these six methods amounted to 415 ± 2 kCi at the instant of the first measurement (12:00, April 29, 2004) and 409 ± 2 kCi prior to the commencement of the calibration experiment for SAGE (04:00, April 30, 2004). The discrepancies between the results obtained by measuring the activity by the different methods was within 5%.
Method for Simulating Events Involving the Electroweak Production of a t Quark in the Next-to-Leading-Order Approximation: SingleTop Event Generator E. E. Boss, V. E. Bunichev, L. V. Dudko, V. I. Savrin, and A. V. Sherstnev
A new method for simulating t-quark production in electroweak processes and its realization in the form of the SingleTop event generator are described. Particular attention is given to correctly unifying events involved in the main process of t-channel production: a 2 → 2 subprocess featuring a b quark in the initial state and a 2 → 3 subprocess featuring
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