EPJ Web Conf.
Volume 260, 2022The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI)
|Number of page(s)||3|
|Published online||24 February 2022|
3He(α,γ)7Be cross section measurement around 7Be known energy levels
1 Institute for Nuclear Research (ATOMKI), Debrecen, Hungary
2 University of Debrecen, Doctoral School of Physics, Debrecen, Hungary
Published online: 24 February 2022
The 3He(α,γ)7Be reaction plays an important role in two astrophysical scenarios. It is a key reaction in lithium production during the Big Bang Nucleosynthesis and one of the central reaction in the p-p chain in stars. In the case of the former event, the Gamow energy of the reaction is around 0.2 MeV, while in the case of the p-p chain in the Sun, an order of magnitude less, around 0.023 MeV. Experimental investigation at such low energies is very difficult, if possible at all, thus low energy extrapolation inevitable to predict the reaction rate at these energies. The extrapolation and its uncertainty are inﬂuenced by the precision and covered energy range of the data used. There are many precision datasets between Ec.m. = 0.3–3.1 MeV, but only one below and one above. At higher energies known levels of 7Be exist, which motivates the study of that energy range. Therefore, we performed investigations in the energy range of Ec.m. = 4.3–8.3 MeV, where the radiative cross section has not been studied so far. For the cross section determination, the activation technique was used utilising a thin-windowed gas cell and the MGC-20 cyclotron of ATOMKI.
© The Authors, published by EDP Sciences, 2022
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