Abstract
The knowledge of the 2H(α,γ)6Li cross section is very important to understand the production of 6Li during the Big-Bang Nucleosynthesis (BBN). Presently, no direct measurement of this reaction in the energy region of interest exists (the only direct measurements actually available are above 1 MeV in the center of mass reference frame and around the 711 keV resonance). The existing data in the energy region of interest for BBN (40 keV < Ecm < 400 keV) have been taken with indirect techniques which are affected by large uncertainties because they strongly depend on theoretical assumptions. The direct measurement is a difficult task because the expected cross section is of the order of a few pico-barn. Thanks to the natural shielding offered by the about 1400 meters of rocks, the cosmic background is reduced by a factor 106 at the Laboratori Nazionali del Gran Sasso (LNGS). Here, at the LUNA (Laboratory for Underground Nuclear Astrophysics) facility it is possible to explore with a direct measurement of the 2H(α,γ)6Li reaction cross section in the BBN energy region. This measurement can be done with a 4He intense beam hitting a windowless deuterium gas target. The emitted photons are detected with a High-Purity Germanium detector (HPGe) in close geometry. In this paper the experimental setup will be described and the measurement strategy based on the first tests already performed will be discussed.
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