Abstract
The astrophysical S-factor of the reaction T(4He, γ)7Li is measured for the first time at the center of mass energy E cm = 15.7 keV, lower than the energy range of the Standard Big Bang Nucleosynthesis (SBBN) model. The experiment is performed on a Hall pulsed accelerator (TPU, Tomsk). An acceleration pulse length of 10 μs allows one to suppress the background of cosmic radiation and the ambient medium by five orders of magnitude. A beam intensity of ~ 5 × 1014 4He+ ions per pulse allows one to measure an extremely low reaction yield. The yield of γ-quanta with the energies E 0γ = 2483.7 keV and E 1γ = 2006.1 keV is registered by NaI(Tl) detectors with the efficiency ε = 0.331 ± 0.026. A method for direct measurement of the background from the chain of reactions T(4He, 4He)T→T(T, 2n)X→(n, γ) and/or (n, n′γ) which ends by neutron activation of materials surrounding the target is proposed and implemented in this study. The value of the astrophysical S-factor of the reaction T(4He, γ)7Li S αt (E cm = 15.7 keV) = 0.091 ± 0.032 keV b provides the choice from the set of experimental data for the astrophysical S αt -factor in favor of experimental data [4] with S αt (E cm = 0) = 0.1067 ± 0.0064 keV b.
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Original Russian Text © V.M. Bystritsky, G.N. Dudkin, E.G. Emets, M. Filipowicz, A.R. Krylov, B.A. Nechaev, A. Nurkin, V.N. Padalko, A.V. Philippov, A.B. Sadovsky, 2017, published in Pis’ma v Zhurnal Fizika Elementarnykh Chastits i Atomnogo Yadra, 2017.
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Bystritsky, V.M., Dudkin, G.N., Emets, E.G. et al. Astrophysical S-factor of T(4He, γ)7Li reaction at E cm = 15.7 keV. Phys. Part. Nuclei Lett. 14, 560–570 (2017). https://doi.org/10.1134/S1547477117040057
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DOI: https://doi.org/10.1134/S1547477117040057