  This paper gives new insight to the study of dynamical effects in proton
breakup as compared to neutron breakup from a weakly bound state in an exotic
nucleus. Following our recent work [Ravinder Kumar and Angela Bonaccorso, Phys.
Rev. C84 014613 (2011)] there has been some discussion in the literature [B.
Paes, J. Lubiana, P.R.S. Gomes, V. Guimar\~aes, Nucl. Phys. A890 1 (2012); Y.
Kucuk and A. M. Moro, Phys. Rev. C86 034601 (2012)], thus in order to clarify
and asses quantitatively which mechanism would dominate measured observables,
we study here several reaction mechanisms separately but also their total
including interference. These mechanisms are: the recoil effect of the
core-target Coulomb potential which we distinguish from the direct
proton-target Coulomb potential and nuclear breakup, which consists of
stripping and diffraction. Direct Coulomb breakup typically gives cross
sections about an order of magnitude larger than the recoil term and the amount
of nuclear diffraction vs. Coulomb depends on the target. Thus for each
mechanism the absolute values of breakup cross sections and parallel momentum
distributions for 8B and 17F projectiles calculated on a light and a heavy
target in a range of intermediate incident energies (40-80A.MeV) are presented.
Furthermore we study in detail the interference among the two Coulomb effects
and nuclear diffraction. The calculation of the direct and recoil Coulomb
effects separately and of their interference is the new and most relevant
aspect of this paper.
