New theoretical results for radiative 3H(p,γ)4He, 3He(2H,γ)5Li, 4He(2H,γ)6Li, 4He(3H,γ)7Li and 4He(3He,γ)7Be captures at astrophysical energies
Abstract
We have studied the proton capture reaction 3H(p,γ)4He. It plays a role in the nucleosynthesis of primordial elements in the early Universe leading to the prestellar formation of 4He nuclei. All results of our researches and more new data from works show that the contribution of the 3H(p,γ)4He capture reaction into the processes of primordial nucleosynthesis is relatively small. However, it makes sense to consider this process for making the picture complete for the formation of prestellar 4He and clearing of mechanisms of this reaction. Furthermore, we have considered the 3He(2H,γ)5Li reaction in the low energy. This reaction also forms part of the nucleosynthesis chain of the processes occurring in the early stages of formation of stable stars. They are possible candidates for overcoming the well-known problem of the A=5 gap in the synthesis of light elements in the primordial Universe. Continuing the study, we have considered the radiative capture 4He(3He,γ)7Be at superlow energies, which has a undeniable interest for nuclear astrophysics, since it takes part in the proton–proton fusion chain, and new experimental data on the astrophysical S-factors of this process at energies down to 90 and 23keV and data on the radiative capture reaction 4He(3H,γ)7Li down to 50keV appeared recently. Moreover, radiative capture reactions 4He(3He,γ)7Be and 4He(2H,γ)6Li may have played a certain role in prestellar nucleosynthesis after the Big Bang, when the temperature of the Universe decreased to the value of 0.3T9.
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