Fusion-evaporation cross sections were measured in the two systems 48 Ca + 90,96 Zr in an energy range from well below to well above the Coulomb barrier. The sub-barrier fusion of 48 Ca + 90 Zr is reproduced by coupled-channels calculations including the lowest quadrupole and octupole vibrations of 90 Zr, and using a Woods-Saxon potential with a standard diffuseness parameter a = 0.68 fm. However, the fusion cross sections are overestimated above the barrier. The low-energy slope of the excitation function for 48 Ca + 96 Zr is steeper. This implies a larger diffuseness parameter a = 0.85 fm. Fusion cross sections are well fit in the whole energy range, and the effect of the strong octupole vibration in 96 Zr is predominant. The extracted fusion barrier distributions are reasonably well reproduced by calculations for both systems. A comparison with previous data for 40 Ca + 90,96 Zr is made in an attempt to clarify the role of transfer couplings in sub-barrier fusion.
The transfer reactions of 11 B(d,p) 12 B and 12 C(d,p) 13 C, at incident energy of 11.8 MeV, have been used to extract asymptotic normalization coefficients and root-mean-square radii for the last neutron in 12 B and 13 C. It is found experimentally that the second (J ϭ2 Ϫ ) and third (J ϭ1 Ϫ ) excited states in 12 B and the first (J ϭ1/2 ϩ ) excited state in 13 C are the neutron halo states, whereas the third (J ϭ5/2 ϩ ) excited state in 13 C is a neutron skin state.
The fusion cross sections of 6 Li+ 208 Pb system at energies near the barrier have been measured by means of the evaporation residue method and have been calculated in terms of the coupled-channels model, taking into account single and double phonon octupole excitations of 208 Pb and the 3 + rotational state of 6 Li. By comparing the experimental results with the theoretical calculations and with the fusion cross section of 16 O+ 208 Pb, in which no breakup happens, we conclude that the fusion cross sections of 6 Li+ 208 Pb are suppressed at abovebarrier energies due to the effects of 6 Li breakup, but below the barrier, the effects of breakup are not clear.
Fusion excitation functions have been measured for the first time with rather good accuracy for 32 S + 90 Zr and 32 S + 96 Zr near and below the Coulomb barrier. The sub-barrier cross sections for 32 S + 96 Zr are much larger than for 32 S + 90 Zr. A coupled-channels calculation considering the inelastic excitations is capable of describing sub-barrier enhancement only for 32 S + 90 Zr. The unexplained part for 32 S + 96 Zr is found to be correlated with the positive-Q-value intermediate neutron transfers in this system. The comparison with 40 Ca + 96 Zr suggests that couplings to the positive-Q-value neutron transfer channels may play a role in the sub-barrier fusion enhancement. Multi-neutron transfers are taken into account in Zagrebaev's semiclassical model to explain the discrepancies of the sub-barrier fusion cross sections for 32 S + 96 Zr.
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