This seminar will introduce a many-channel microscopic cluster model developed to describe high-energy resonance states in 9Be and 9B near the 7Li+d and 7Be+d decay thresholds, offering insights into the cosmological lithium problem. The model incorporates two coupled three-cluster configurations: α+α+n and α+d+3H in 9Be, and α+α+p and α+d+3He in 9B. These configurations are further reduced to a set of binary channels that dictate the nuclear dynamics and resonance structure of the compound nucleus across a broad energy spectrum.
Key attention will be given to the influence of resonance states on astrophysical S-factors, particularly in reactions involving 7Li, 7Be, 6Li, 3H, 3He, and a deuteron. The model's results show good agreement with experimental data, highlighting the essential roles of resonance states and channel coupling in shaping S-factors.
L. Fortunato