Seminarium Fizyki Jądra Atomowego

The de-excitation of the hot rotating nuclei produced in complete and incomplete fusion reaction could be described within statistical codes such as GEMINI++ [1] or in dynamical approaches by solving the transport equations of Langevin type [2]. In the experiment the hot rotating nuclei are formed in the fusion reaction of two heavy ions. At low bombarding energies the reaction goes via compound nucleus formation and subsequent evaporation of charged particles, neutrons and gamma-rays. However, with increasing the beam the emission of particles during the equilibration process becomes more and more probable. This effect can be estimated by the HIPSE [3] code which describes production of compound systems by merging nucleons in bigger and bigger clusters within microscopic frame. This dynamic evolution finalizes with the compound nuclei, quasi-fission or multifragmentation products.
We analyzed with different approaches (GEMINI++, Langevin, HIPSE) and compare the results with existing experimental data, the reaction of 48Ti+40Ca with 300 and 600 MeV beam energies [4]. Such reaction which leads via complete fusion to the compound nucleus 88Mo or to the lighter systems after pre-equilibrium particle emission. These excited products could de-excite by emitting particles, γ-rays including the Giant Dipole Resonance (GDR) or by a fission exit channel. The preliminary results of influence of the pre-equilibrium particle emission on the distribution of compound nuclei, its angular momenta and excitation energies will be presented. The entrance channel effects will be correlated with the final mass/charge distributions and GDR strength functions.

[1] R.J. Charity, Phys. Rev.C 82, 014610 (2010)
[2] P.N. Nadtochy, et al. Phys. Rev. C 89, 014616 (2014)
[3] D. Lacroix, A. Van Lauwe, D. Durand Phys. Rev. C 69, 054604 (2004)
[4] M. Ciemała et al. Phys. Rev. C 91, 054313 (2015)