Abstract
In this paper an overview of different results concerning elastic scattering in collisions induced by halo nuclei will be given. Due to the very low binding energy of such nuclei, coupling effects with the break-up channel have been found to be very important. Moreover, due to the long tail of the density distribution of halo nuclei and the presence of a large low-lying dipole strength distribution, long range absorption affects the elastic scattering angular distribution. In the paper the main effects responsible for the observed features in the scattering cross-section will be discussed.
Highlights
Nuclear halo is a threshold phenomenon arising from the very weak binding of the last one or two valence nucleons which decouples from an inert core that contains all the other nucleons [1]
Elastic scattering experiments involving halo nuclei have been performed at several energies and on targets covering a wide range of masses
By assuming an exponential tail for the imaginary surface potential, its diffuseness is directly related to the decay length of the halo wave function
Summary
Nuclear halo is a threshold phenomenon arising from the very weak binding of the last one or two valence nucleons which decouples from an inert core that contains all the other nucleons [1]. Elastic scattering experiments involving halo nuclei have been performed at several energies and on targets covering a wide range of masses. A common feature observed in the low-energy halo-induced elastic scattering, on medium mass and heavy targets, is a reduction of the Coulomb-nuclear interference peak The extracted real part of the TLP was found to be repulsive at a distance around the sum of the projectile and target radii, whereas the imaginary part has a diffuse tail These features are similar to the ones found in collisions induced by weakly bound. In their analysis OM calculations were performed which required a complex DPP potential, that was added to the double-folding bare potential. For matter of comparison, the crosssections were reduced, in order to eliminate trivial static effects, according to what suggested by [31], where:
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