A Systematic Study of Astrophysical Reaction Rates through [sup 8]Li

Spectroscopy of high lying resonances in9Be produced with radioactive8Li beams

“…= 2.11 ± 0.04 MeV for the p+ 8 Li system, thus all resonances in 9 Be below E c.m. = 2.15 MeV could be populated while the 8 Li projectile is slowing down in the thick target.…”

“…The 7 Li 3+ primary beam was accelerated by the Pelletron Tandem to energies between 16 and 22 MeV and its intensity was typically 300 nAe. We have used a 9 Be foil of 16 μm thickness as the production 8 Be transfer reaction (Q = 0.367 MeV). The primary beam is stopped in a Faraday cup, constituted by an isolated tungsten rod which stops all particles in the angular region from 0 to 2 degrees and where the primary beam intensities were integrated.…”

“…A transfer reaction offers several advantages. In particular, the isospin of the exit channel limits the population of T = 1/2 states in 9 Be, and interference with the Coulomb interaction, which are dominant in elastic-scattering experiments, are absent in a transfer reaction. The recent measurement of the elastic scattering 8 Li(p,p) 8 Li intends to constrain the resonance parameters, since the resonance energies and proton partial widths are the same in the calculations.…”

“…Reactions associated with 8 Li can also play an important role in nuclear astrophysics [9]. In particular, the 8 Li(α,n) 11 B reaction could affect the non-standard Big-Bang nucleosynthesis (see Ref.…”

“…The first goal of our work was to investigate the 9 Be structure near the proton threshold (16.89 MeV) through the 8 Li(p,α) 5 He reaction. The 9 Be level scheme is well known at low excitation energies [7,8], but the high-energy region is still uncertain.…”