The effect of 6Li and 6He breakup on the fusion cross
section of these nuclei with 208Pb is investigated by
means of continuum-discretized coupled-channels (CDCC)
calculations. For 6Li the calculations describe reasonably
well the experimental data for elastic scattering,
6Li -> alpha + d breakup and the absorption cross section
given by the sum of the 6Li fusion and the alpha
production cross section not attributed to breakup.
The effect of 6Li breakup on the calculated absorption cross section is found to depend strongly
on the imaginary part of the diagonal bare potential.
A combination of the CDCC technique and the barrier
penetration model (BPM) generates results close to
the measured fusion cross section. For 6He the calculated
absorption cross section is much larger than the
measured 6He + 209Bi complete fusion cross section
values. However, it is found to be relatively independent
of the form of the imaginary part of the bare potential.
The complete fusion cross section is again found to be
reasonably well described by the CDCC/BPM combination. |
