1201.5318 (V. E. Oberacker et al.)

Dynamic microscopic study of pre-equilibrium giant resonance excitation
and fusion in the reactions $^{132}$Sn+$^{48}$Ca and $^{124}$Sn+$^{40}$Ca    [PDF]

V. E. Oberacker, A. S. Umar, J. A. Maruhn, P. -G. Reinhard

We study pre-equilibrium giant dipole resonance excitation and fusion in the
neutron-rich system $^{132}$Sn+$^{48}$Ca at energies near the Coulomb barrier,
and we compare photon yields and total fusion cross sections to those of the
stable system $^{124}$Sn+$^{40}$Ca. 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.

View original: http://arxiv.org/abs/1201.5318