Description
Nuclear Dynamics : from fission to multifragmentation
Within the transport model evaluation project (TMEP collaboration) of simulations for heavy-ion collisions, the mean-field dynamics of local density fluctuations is examined in several transport models widely employed to describe nuclear reactions.
The results of transport codes belonging to two families (BUU-like and QMD-like) are compared among each other and to exact calculations. For...
The antisymmetrized molecular dynamics (AMD)[1] is one of the most successful transport models, applied in intermediate heavy ion collisions. AMD usus a frozen (crystal) concept for the initial nuclei and the Fermi motion is taken into account as an average Fermi energy, T0 ~ 9 MeV/nucleon, in the energy calculation. This brings the stability of the initial nuclei in the time evolution, but...
Abstract: In this study, we analyze the experimental data from heavy-ion collision (HIC) using 40Ca and 48Ca beams at 140 MeV/u impinging on 58Ni and 64Ni targets. The experimental set up includes a charged particle array HiRA10 and the neutron wall array, LANA. From the charged particles, we construct coalescence invariant ratios of pseudo-neutrons and protons as a function of transverse...
The complete microscopic description of the fission process is still a challenge for nuclear theory. Density functional theory (DFT) and Time-Dependent DFT are tools of choice to describe fission. However, it can be difficult to extract information about the fragments that are needed for comparison with experience or as input for the r-process model.
In this presentation, I will discuss...
J. Benlliure 1 , J. Díaz 1 , H. Alvarez-Pol 1 , T. Aumann 2 , C.A. Bertulani 3 , B. Blank 4 , E. Casarejos 1 , D. Cortina 1 , D. Dragosavac 1 , V. Fohr 5 , A. Gargano 6 , M. Gascón 1 , W. Gawlikowicz 7 , A. Heinz 5 , K. Helariutta 8 , A. Kelic 5 , F. Montes 5 , L. Pienkowski 7 , J.L. Rodríguez-Sánchez 1 , K.-H. Schmidt 5 , M. Staniou 5 , K. Subotic 9 , K. Summerer 5 , J. Taieb 10 , A....
Density determinations for neck fragmentation (ternary reactions) has been shown [1] for the reaction 124Sn + 64Ni at 35 AMeV, as investigated by using the CHIMERA multi-detector [2]. The analysis is now applied to the system 112Sn + 58Ni and the reactions induced by 124Xe on 64Zn and 64Ni targets at the same incident energy. In these last cases the two systems differ only for the target...
The nuclear caloric curve is an emergent property of the nuclear equation of state. Some models predict the caloric curve depends on the neutron excess, but the magnitude and even sign of this dependence varies between models. We aim to characterize the asymmetry dependence of the nuclear caloric curve experimentally. Since the caloric curve emerges from the microscopic interaction, knowledge...
B. Borderie et al. - INDRA Collaboration
By using freeze-out properties of multifragmenting hot nuclei produced in quasi-fusion central 129 Xe+ nat Sn collisions at different bombarding energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the 4π INDRA multidetector, heat capacity in the thermal excitation energy range 4 -...
In the transition from nuclear matter to finite nuclei, complex finite-size effects which characterise open systems arise, in relation with either the nuclear surface or the bulk. In addition, the non-equilibrium character of the process, typical of violent heavy-ion collisions (from Fermi energy to the intermediate-energy domain) adds up as well. The resulting dynamics is the combination of...
Depending on the energy regime, the dynamics of heavy-ion collisions reveals a variety of different mechanisms which are attributed to the combination of collective and dissipative effects.
Whereas at low and high energies only one of the two contributions tends to prevail, the description of Fermi-to-intermediate energy regimes imposes to address the interplay between collective and chaotic...
