Boron depletion: indirect measurement of the 10B(p,α)7Be S(E)-factor

The 10B(p,α)7Be reaction is the main responsible for 10B destruction in stellar interior. In such environments this p-capture process occurs at a Gamow energy of ∼10 keV, and takes places mainly through a resonant state (Ex=8.701 MeV) of the compound 11C nucleus. Thus, a resonance right in the region of the Gamow peak is expected to significantly influence the behaviour of the astrophysical S(E)-factor. The 10B(p,α)7Be reaction has been investigated by means of the Trojan Horse Method (THM) applied to the 2H(10B,α7Be)n three-body process. The experiment was performed at Ebeam=27 MeV at the Instituto de Fisica Nuclear de São Paulo. Preliminary results concerning the extraction of the bare-nucleus S(E)-factor will be presented.