Coulomb-nuclear dynamics in the weakly-bound 8Li breakup

Abstract

A detailed study of total, Coulomb and nuclear breakup cross sections dependence on the projectile ground-state binding energy ${\epsilon }_b$ is presented, by considering the ${}^8$Li+${}^{12}$C and ${}^8$Li+${}^{208}$Pb breakup reactions. To this end, apart from the experimental one-neutron separation energy of ${}^8$Li nucleus (${\epsilon }_b=2.03$~MeV), lower values of ${\epsilon }_b$ down to ${\epsilon }_b=0.01$~MeV, are also being considered. It is shown that all breakup processes become peripheral as ${\epsilon }_b\to 0.01$ MeV, which is understood as due to the well-known large spacial extension of ground-state wave functions associated to weakly-bound projectiles. The Coulomb breakup cross section is found to be more strongly dependent on ${\epsilon }_b$ than the nuclear breakup cross section, such that the Coulomb breakup becomes more significant as ${\epsilon }_b$ decreases, even in a naturally nuclear-dominated reaction. This is mainly due to the long-range nature of the Coulomb forces, leading to a direct dependence of the Coulomb breakup on the electromagnetic transition matrix. It is also highlighted the fact that the nuclear absorption plays a minor role for small binding when the breakup becomes more peripheral.

arXiv comment12 pages, 11 figures

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Cited by in corpus (1)

• Deformation, halo, and bubble structure: A paradigm shift of exotic phenomena in light to medium mass nuclei