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Strong neutron transfer coupling in the fusion of the 18O + 92Mo

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					Strong neutron transfer coupling in the fusion of the 18O + 92Mo system.
E. Crema, D. S. Monteiro, R. F. Simões, J. M.B. Shorto, L. K. Ono, N. Added.
Departamento de Física Nuclear da Universidade de São Paulo - São Paulo - Brazil



         Precise quasi-elastic scattering excitation functions have been measured for the systems
16,18        92
        O+        Mo at energies near the Coulomb barrier. In order to obtain a representation of the
fusion barrier distributions, the quasi-elastic excitation functions have been differentiated with
respect to energy by using the point difference approximation with small steps in energy. The
experimental representation of the barrier distributions were compared with coupled channel
                                                                                   16       92
calculations and good agreement was obtained in both cases. In the                  O +          Mo system the
quadrupole and octupole vibrations of the target are the most important channels in the coupling
                                                                                   18
scheme. However, the more complex barrier distribution in the system                    O + 92Mo seems to be
due to a strong coupling of the one-neutron stripping channel with the relative motion degree of
freedom. On the other hand, according to our calculations, there is some evidence that the two-
neutron stripping and the quadrupole vibration of the target channels should be also included in
the coupling scheme of this complex system.

				
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