Resumen

CARDENAS, W.H.Z. et al. Schematic coupled-channel calculations for nuclear reactions with unstable beams. Braz. J. Phys. [online]. 2004, vol.34, n.3b, pp. 1254-1264. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332004000600017.

We study nuclear reactions in collisions of unstable projectiles with heavy targets. For this purpose, we use a simple approximation for the breakup channel and treat two-neutron halos as a single particle. We then evaluate cross sections for collisions of ⁶He projectiles with targets of ²³⁸U and ²⁰⁹Bi. Comparing our results with recently measured fusion cross sections, we conclude that the large enhancement observed in ⁶He+²³⁸U fusion at sub-barrier energies cannot be explained by the coupling with the breakup channel. The effects of the halo on other reaction channels are also investigated. Coulomb-nuclear interference in the breakup channel is discussed.