Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-01-25
Phys. Rev. C 85, 034609 (2012)
Physics
Nuclear Physics
Nuclear Theory
9 pages, 9 figures
Scientific paper
10.1103/PhysRevC.85.034609
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.
Maruhn Joachim A.
Oberacker Volker E.
Reinhard Paul-Gerhard
Umar Sait A.
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