We investigate the fusion barriers for reactions involving Ca isotopes ${}^{40}\mathrm{Ca}{+}^{40}\mathrm{Ca}$, ${}^{40}\mathrm{Ca}{+}^{48}\mathrm{Ca}$, and ${}^{48}\mathrm{Ca}{+}^{48}\mathrm{Ca}$ using the microscopic time-dependent Hartree-Fock (TDHF) theory coupled with a density constraint. In this formalism the fusion barriers are directly obtained from TDHF dynamics. We also study the excitation of the preequilibrium GDR for the ${}^{40}\mathrm{Ca}{+}^{48}\mathrm{Ca}$ system and the associated $\gamma$-ray emission spectrum. Fusion cross sections are calculated using the incoming-wave boundary condition approach. We examine the dependence of fusion barriers on collision energy as well as on the different parametrizations of the Skyrme interaction.

• Received 17 February 2012

DOI:https://doi.org/10.1103/PhysRevC.85.044606