On the absorptive potential in heavy ion scattering

The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
Nuclear Physics A (Impact Factor: 2.2). 05/1981; 361(1):307-325. DOI: 10.1016/0375-9474(81)90480-2


A preliminary investigation of the nuclear imaginary potential to be used for the analysis of elastic scattering data of heavy ions is presented. The derivation is carried out in the framework of the semiclassical description. The resulting potential is angular momentum independent and shows two components. A long range part due to transfer reactions and a short range part due to nuclear inelastic scattering. Coulomb excitation has not been taken into account. Simple closed expressions are derived for the transition amplitudes associated with the transfer and inelastic processes, including the Q-value dependence which can be used for the analysis of reaction data.

Download full-text


Available from: G. Pollarolo, Mar 07, 2014
8 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: We propose a simple model for estimating the nucleon transfer contribution to the imaginary part of the nucleus-nucleus optical potential. Using the proximity method we calculate the transfer probability per unit time in terms of the flux of nucleons between two slabs. Pauli blocking and barrier penetration effects are taken into account. We compare our results with phenomenological potentials at the strong absorption radius. NUCLEAR REACTIONS Imaginary part of the heavy ion optical potential. Nucleon transfer contribution. Barrier penetration, Pauli blocking, and relative motion effects.
    Physical Review C 04/1982; 25:5(5). DOI:10.1103/PhysRevC.25.2450 · 3.73 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: An approximate semiclassical formula for the imaginary part of the scattering phase shift due to Feshbach's second-order optical potential has been obtained. This formula has been applied to the alpha-40Ca system and the imaginary phases compared with those calculated from phenomenological optical potentials fitted to the experimental data. The target nucleus was described by a harmonic oscillator shell model and the alpha-nucleus interaction was obtained from a phenomenological alpha-nucleon interaction. This model gives an absorption which is stronger than that calculated from phenomenological potentials by a factor of two for a low alpha-particle incident energy (Elab = 29 MeV). The discrepancy is less for higher energies. The results are very sensitive to the strength of the alpha-nucleon interaction. It was found that the giant quadrupole and monopole collective states make only a small contribution to the total absorption.
    Nuclear Physics A 08/1982; 384(1):161-178. DOI:10.1016/0375-9474(82)90311-6 · 2.20 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A description of heavy ion reactions involving deformed nuclei in terms of classical trajectories is presented. The scheme takes into account the three-dimensional aspects of the relative motion and the nuclear rotation and provides predictions of cross sections for inelastic excitation and transfer. Contours of the transfer double differential cross section as a function of the rotational angular momentum and the scattering angle display characteristic patterns depending on the localization of the transfer form factors. The results can be used to explore the amplitude of nucleon wave functions along the surface of the deformed nucleus.
    Nuclear Physics A 11/1982; 389(1-389):191-204. DOI:10.1016/0375-9474(82)90298-6 · 2.20 Impact Factor
Show more