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We have studied the proton-capture reaction 3H(p,{\gamma})4He. It plays arole in the nucleosynthesis of primordial elements in the early Universeleading to the pre-stellar formation of 4He nuclei. All results of ourresearches and more new data from works show that the contribution of the3H(p,{\gamma})4He capture reaction into the processes of primordialnucleosynthesis is relatively small. However, it makes sense to consider thisprocess for making the picture complete of the formation of prestellar 4He andclearing of mechanisms of this reaction. Furthermore, we have considered the3He(2H,{\gamma})5Li reaction in the low energy range in the modified potentialcluster model with splitting of orbital states according to Young tableaux and,in some cases, with forbidden states. These reaction also form part of thenucleosynthesis chain of the processes occurring in the early stages offormation of stable stars, and are possible candidates for overcoming thewell-known problem of the A = 5 gap in the synthesis of light elements in theprimordial Universe. Continuing study we have considered the radiative capture4He(3He, {\gamma})7Be at superlow energies, which has a undeniable interest fornuclear astrophysics, since it takes part in the proton-proton fusion chain,and new experimental data on the astrophysical S-factors of this process atenergies down to 90 keV and 23 keV and data on the radiative capture reaction4He(3H,{\gamma})7Li down to 50 keV appeared recently. Moreover, radiativecapture reactions 4He(3He,{\gamma})7Be and 4He(2H,{\gamma})6Li may have playeda certain role in prestellar nucleosynthesis after the Big Bang, when thetemperature of the Universe decreased to the value of 0.3 T9.

international journal of modern physics e

New Theoretical Results for Radiative 3H(p, {\gamma})4He, 3He(2H,  {\gamma})5Li, 4He(2H, {\gamma})6Li, 4He(3H, {\gamma})7Li, and 4He(3He,  {\gamma})7Be Captures At Astrophysical Energies