Dynamic microscopic study of pre-equilibrium giant resonance excitation and fusion in the reactions 132Sn+48Ca and 124Sn+40Ca
Abstract
We study pre-equilibrium giant dipole resonance excitation and fusion in the neutron-rich system 132Sn+48Ca at energies near the Coulomb barrier, and we compare photon yields and total fusion cross sections to those of the stable system 124Sn+40Ca. The dynamic microscopic calculations are carried out on a three-dimensional lattice using both the Time-Dependent Hartree-Fock method and the Density Constrained TDHF method. We demonstrate that the peak of the GDR excitation spectrum occurs at a substantially lower energy than expected for an equilibrated system, thus reflecting the very large prolate elongation of the dinuclear complex during the early stages of fusion. Our theoretical fusion cross-sections for both systems agree reasonably well with recent data measured at HRIBF.
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