最佳项目中人工51CR中微子源的生产

论文标题

最佳项目中人工51CR中微子源的生产

Production of the artificial 51Cr neutrino source in the BEST project

论文作者

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.

论文摘要

提出了最佳的实验> 3 MCI的人工51CR中微子来源的生产。该过程包括制造50CR靶标并在核反应堆SM-3中用热中子照射。以厚度为4 mm，直径为84和88毫米的盘形式产生目标的产生包括富集（50cr中的96.5％）自然铬的形式，通过气体离心，电解性，电解性减少和金属铬的促进，以及金属铬的精炼以及金属铬的形成，以及由铬的形成。进行了各种源几何形状，中子通量和核传输的模拟，以验证源的设计，辐照装置和传输容器，目标的所需化学纯度以及反应器中的辐射时间表。 75天生效日期后，源的计算活性为3.55 mci。源的活性通过量热法测量，并在传递到巴肯中微子天文台时达到3.41 MCI。这是有史以来最强烈的化学中微子来源。

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.

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