Breakup and transfer reactions in the 17Ne+208Pb system close to the Coulomb barrier

A two-body O-15+He-2 cluster model is applied to continuum discretized coupled channel (CDCC) calculations for the 136-MeV 17Ne + 208Pb system. With O-15 + He-2 binding potential parameters tuned so that either of the two B(E2; 1/2(1)(-) -> 5/2(1)(-)) values for 17Ne available in the literature are reproduced, the calculations provide a reasonable description of the elastic scattering data. A comparison of the predicted breakup angular distributions with the measured inclusive O-15 production cross section supports the conclusion of previous coupled channel calculations that the larger of the two B(E2; 1/2(1)(-) -> 5/2(1)(-)) values may be excluded since the calculation based on it significantly over predicts the forward angle data. Further calculations find that the 1.908-MeV 1/2(+) resonance of Ne-17 cannot be simultaneously described with the 1.288-MeV 3/2(-) and 1.764-MeV 5/2(-) resonances by an internally consistent calculation within the two-body model. Arguments based on Q-value matching considerations that a large peak in the measured inclusive O-15 cross section centered at theta(lab). = 55 degrees which the CDCC calculations fail to describe is due to 1p stripping to the giant quadrupole resonance in Bi-209 are supported by distorted wave Born approximation calculations, providing a novel illustration of Q-value matching in action.