5 research outputs found

    The СС1-3 cyclotron system for non-destructive nuclear-physical methods of the element analysis

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    The СС1-3 cyclotron system is intended to be installed in the laboratory of nuclear-physical methods of the element analysis of the Vinca Institute of Nuclear Sciences, Belgrade, Serbia. The cyclotron system ensures production of a beam of protons with energy in the range from 1 to 3 MeV with a spectrum width not more than 0.1%. The equipment of the cyclotron system has been manufactured and tested on test facilities in the D.V. Efremov Institute.Циклотронний комплекс СС1-3 призначений для оснащення лабораторії ядерно-фізичних методів елементного аналізу Інституту ядерних наук Вінча, Белград, Сербія. Циклотронний комплекс забезпечує отримання пучка протонів з енергією в діапазоні від 1 до 3 МеВ при ширині спектра не більше 0,1%. Обладнання циклотронного комплексу виготовлено та випробувано на стендах НІІЕФА ім. Д.В. Єфремова.Циклотронный комплекс СС1-3 предназначен для оснащения лаборатории ядерно-физических методов элементного анализа Института ядерных наук Винча, Белград, Сербия. Циклотронный комплекс обеспечивает получение пучка протонов с энергией в диапазоне от 1 до 3 МэВ при ширине спектра не более 0,1%. Оборудование циклотронного комплекса изготовлено и испытано на стендах НИИЭФА им. Д.В. Ефремова

    Direct and sequential radiative three-body reaction rates at low temperatures

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    We investigate the low-temperature reaction rates for radiative capture processes of three particles. We compare direct and sequential capture mechanisms and rates using realistic phenomenological parametrizations of the corresponding photodissociation cross sections.Energy conservation prohibits sequential capture for energies smaller than that of the intermediate two-body structure. A finite width or a finite temperature allows this capture mechanism. We study generic effects of positions and widths of two- and three-body resonances for very low temperatures. We focus on nuclear reactions relevant for astrophysics, and we illustrate with realistic estimates for the α\alpha-α\alpha-α\alpha and α\alpha-α\alpha-nn radiative capture processes. The direct capture mechanism leads to reaction rates which for temperatures smaller than 0.1 GK can be several orders of magnitude larger than those of the NACRE compilation.Comment: To be published in European Physical Journal
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