Author:
Danshin S.N.,Gavrin V.N.,Gorbachev V.V.,Ibragimova T.V.,Komarov B.A.,Kozlova J.P.,Martynov A.A.,Veretenkin E.P.,Akimov L.V.,Kupriyanov A.V.,Malkov A.P.,Petelin A.L.,Pimenov V.V.,Romanov E.G.,Sazontov S.A.,Tabakin E.M.,Tarasov V.A.,Torgashov I.V.,Uzikov V.A.,Zvir A.I.,Kalaschnikova A.A.
Abstract
Abstract
The production of the artificial 51Cr neutrino source
with activity > 3 MCi for the experiment BEST is presented. This
procedure consisted of making a 50Cr target and irradiating it
with thermal neutrons in a nuclear reactor SM-3. The production of a
target in the form of disks with a thickness of 4 mm and a diameter
of 84 and 88 mm included enrichment (to 96.5% in 50Cr) of
natural chromium in the form of oxyfluoride by gas centrifugation,
electrolytic reduction and refining of metallic chromium, as well as
the formation of chromium disks by spark plasma
sintering. Simulations of various source geometries, neutron flux
and nuclear transmutation were carried out to validate the design of
the source, the irradiation device and the transport container, the
required chemical purity of the target and the irradiation schedule
in the reactor. The calculated activity of the source after 75
effective days of irradiation was 3.55 MCi. The activity of the
source was measured by the calorimetric method and amounted to
3.41 MCi at the time of its delivery to the Baksan Neutrino
Observatory. This is the most intense chemically pure neutrino
source ever produced.
Subject
Mathematical Physics,Instrumentation
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