SEMINARIO DI GRUPPO 4 INFN

Recently a quantitative description of the two-neutron transfer reaction 12C(18O,16O)14C was performed and the measured cross sections were successfully reproduced [M. Cavallaro et al., Phys. Rev. C 88, 054601 (2013)]. This task was accomplished by combining nuclear structure calculations of spectroscopic amplitudes and a full quantum description of the reaction mechanism. Verification of such a theoretical approach to other heavy nuclear systems is mandatory in order to use (18O,16O) reactions to assess pair configurations in nuclear states. In this talk I show that this methodology is valid also in the 16O(18O,16O)18O and 13C(18O,16O)15 reactions at 84 MeV. 
Experimental angular distributions for the two-neutron transfer were obtained using the MAGNEX spectrometer at INFN-LNS. The roles of one- and two-step processes are analyzed under the exact finite range coupled reaction channel and the second order distorted wave Born approximation. We conclude that the one-step transfer mechanism is dominant for these systems. The preliminary results for the 64Ni(18O,16O)66Ni reaction will be also discussed. The competition between long (collective)and short range correlations (pair) will be discussed.