Effect of E1 excitations to the continuum: He-6 and Li-6 + compared - INSPIRE

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Effect of E1 excitations to the continuum: He-6 and Li-6 + compared

Nov, 2003

7 pages

Published in:

Phys.Rev.C 68 (2003) 054601

DOI:

10.1103/PhysRevC.68.054601

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Abstract: (APS)

We compare existing elastic scattering data for He6+Bi209 with new Li6+Bi209 data at the same center of mass energies relative to their respective Coulomb barriers. Total reaction cross sections obtained from optical model fits to the Li6+Bi209 elastic scattering data confirm previous suggestions that the total reaction cross section for He6+Bi209 is much larger than that for the Li6+Bi209 system at similar energies relative to the Coulomb barrier. Continuum-discretized coupled channels calculations suggest that the enhanced reaction cross section for He6 is due to the large E1 excitation strength to the continuum, absent in Li6. However, this conclusion is still tentative, as the calculations predict a large peak in the total α yield at forward angles which the currently available data are unable to confirm, due to their not extending to sufficiently small angles. New precise data for the elastic scattering and total α yield at forward angles for the He6+Bi209 system are required to confirm the contribution of E1 excitation to the continuum to the total reaction cross section.

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