Toward a global description of the nucleus-nucleus interaction

Physical Review C (Impact Factor: 3.72). 02/2002; DOI: 10.1103/PhysRevC.66.014610
Source: arXiv

ABSTRACT Extensive systematization of theoretical and experimental nuclear densities and of optical potential strengths exctracted from heavy-ion elastic scattering data analyses at low and intermediate energies are presented.The energy-dependence of the nuclear potential is accounted for within a model based on the nonlocal nature of the interaction.The systematics indicate that the heavy-ion nuclear potential can be described in a simple global way through a double-folding shape,which basically depends only on the density of nucleons of the partners in the collision.The poissibility of extracting information about the nucleon-nucleon interaction from the heavy-ion potential is investigated. Comment: 12 pages,12 figures

  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: Quasifission, a fission-like reaction outcome in which no compound nucleus forms, is an important competitor to fusion in reactions leading to superheavy elements. The precise mechanisms driving the competition between quasifission and fusion are not well understood.Purpose: To understand the influence reaction parameters have on quasifission probabilities, an investigation into the evolution of quasifission signatures as a function of entrance channel parameters is required.Methods: Using the Australian National University's (ANU) CUBE detector for two-body fission studies, measurements were made for a wide range of reactions forming isotopes of curium. Important quasifission signatures—namely, mass-ratio spectra, mass-angle distributions, and angular anisotropies—were extracted.Results: Evidence of quasifission was observed in all reactions, even for those using the lightest projectile (12C+232Th). But the observables showing evidence of quasifission were not the same for all reactions. In all cases, mass distributions provided some evidence of the possible presence of quasifission but were not sufficient in most cases to clearly identify reactions for which quasifission was important. For reactions using light projectiles (12C, 28,30Si, 32S), experimental angular anisotropies provided the clearest signature of quasifission. For reactions using heavier projectiles (48Ti, 64Ni), the presence of mass-angle correlations in the mass-angle distributions provided strong evidence of quasifission and also provided information about quasifission timescales.Conclusions: The observable offering the clearest signature of quasifission differs depending on the reaction timescale.
    Physical Review C 09/2013; · 3.72 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We have analyzed the backward angle quasi-elastic excitation function and the barrier distribution for the 7Li + 144Sm system by considering not only the direct breakup of the projectile, the inelastic excitations of the target and the one-neutron transfer channel, but also the sequential breakup of 7Li as a two-step process: the stripping of one neutron followed by the breakup of 6Li. The agreement of the theoretical calculations with the experimental barrier distribution is good, even without any fit procedure. This result confirms some recent experimental evidences showing the importance of this two-step process to 7Li breakup.
    Journal of Physics G Nuclear and Particle Physics 12/2013; 40(12):5105-. · 5.33 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The 12C + 12C fusion reaction is investigated in a multichannel folding model, using the density-dependent DDM3Y nucleon-nucleon interaction. The 12C(01+,2+,02+,3-) states are included, and their densities are taken from a microscopic cluster calculation. Absorption to fusion channels is simulated by a short-range imaginary potential, and the model does not contain any fitting parameter. We compute elastic and fusion cross sections simultaneously. The role of 12C + 12C inelastic channels, and in particular of the 12C(01+) + 12C(02+) channel involving the Hoyle state, is important even at low energies. In the Gamow region, the energy range relevant in astrophysics, inelastic channels increase the S factor by a factor of three.
    Physics Letters B 06/2013; 723(4):355-359. · 4.57 Impact Factor

Full-text (2 Sources)

Available from
May 20, 2014