The Be-9 + Bi-209 fusion cross sections were measured in the range 37.5 MeV less than or equal to E-lab less than or equal to 45.0 MeV at the Munich Tandem via the observation of ground state alpha-decay of the evaporation residues. Fusion cross sections of Bi-209 with the "halo" Be-11 unstable projectile in the region around the Coulomb barrier were deduced from an experiment done with the same technique at the RIKEN Ring Cyclotron. Above the Coulomb barrier the Be-11 cross sections are larger than the Be-9 ones in agreement with theoretical predictions based on the larger Be-11 halo radius. Also below the barrier these theories foresee the same behavior in disagreement with the experimental results, since the two cross sections are rather similar.
Fusion around the barrier in Be-11,Be-9+Bi-209
SIGNORINI, COSIMO;SORAMEL, FRANCESCA;
1998
Abstract
The Be-9 + Bi-209 fusion cross sections were measured in the range 37.5 MeV less than or equal to E-lab less than or equal to 45.0 MeV at the Munich Tandem via the observation of ground state alpha-decay of the evaporation residues. Fusion cross sections of Bi-209 with the "halo" Be-11 unstable projectile in the region around the Coulomb barrier were deduced from an experiment done with the same technique at the RIKEN Ring Cyclotron. Above the Coulomb barrier the Be-11 cross sections are larger than the Be-9 ones in agreement with theoretical predictions based on the larger Be-11 halo radius. Also below the barrier these theories foresee the same behavior in disagreement with the experimental results, since the two cross sections are rather similar.Pubblicazioni consigliate
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