Li : a cosmological problem from a nuclear physics perspective.

The primordial abundance discrepancy in the lithium 7 between the prediction from the cosmological observations, like the cosmic microwave background, and the stellar abundances is one of the main astrophysical sources of concern for big bang nucleosynthesis. While various solutions are proposed, the focused of this work is on a nuclear origin. This motivated the study of 7Li(alpha,gamma)11B. The 5U accelerator of the Nuclear Science laboratory at the University of Notre Dame was used to accelerate a alpha beam on a LiF target. The Ge-detectors Online Array for Gamma Ray Spectroscopy in Nuclear astrophysics (Georgina) was used to detect gamma rays from three resonances at 401, 814 and 953 keV in 11B. Preliminary results will be presented.