Subbarrier fusion with aligned 23Na ions.

Abstract

Fusion cross sections and second-rank-tensor analyzing powers for fusion have been measured at energies around the fusion barrier for $^{23}\mathrm{Na}$ + $^{48}\mathrm{Ti}$ and $^{23}\mathrm{Na}$ + $^{206}\mathrm{Pb}$ with polarized (aligned) projectiles. The data are compared with results from coupled-channels calculations. The energy dependence of the second-rank-tensor analyzing power for fusion is well described for both systems if we take into account coupling to excited states of projectile and target. The same calculations still underpredict the cross section for fusion at subbarrier energies.