A study of elliptical flow is presented with respect to the asymmetry of colliding nuclei using the reactions of 24 Cr 50 + 44 Ru 102 , 16 S 32 + 50 Sn 120 and 8 O 16 + 54 Xe 136 at incident energies between 50 and 250 MeV/nucleon within the framework of isospin-dependent quantum molecular dynamics model. For the present analysis, total mass of the colliding pairs is kept fixed and asymmetry is varied as η = 0.2, 0.3, 0.7. The elliptical flow shows a transition from in-plane to out-of-plane in the mid rapidity region with incident energy. The transition energy is found to increase with the asymmetry for lighter fragments.
We present a complete systematically theoretical study of multifragmentation for asymmetric colliding nuclei for heavy-ion reactions in the energy range between 50 MeV/nucleon and 600 MeV/nucleon by using soft and hard equations of state. This study is performed within an isospindependent quantum molecular dynamics model. To see the effect of mass asymmetry, simulations are carried out in the absence of Coulomb interactions. Coulomb interactions enhances the production of fragments by about 20%. We envision an interesting outcome for large asymmetric colliding nuclei. Although nearly symmetric nuclei depict a well known trend for rising and falling with a peak around E= 100 MeV/nucleon, this trend, however, is completely missing for large asymmetric nuclei. Therefore, experiments are needed to verify this prediction.
Using an isospin-dependent quantum molecular dynamics (IQMD) model, nuclear stopping is analyzed in asymmetric colliding channels by keeping the total mass fixed. The calculations have been carried by varying the asymmetry of the colliding pairs with different neutron-proton ratios in center of mass energy 250 MeV/nucleon and by switching off the effect of Coulomb interactions. We find sizable effect of asymmetry of colliding pairs on the stopping and therefore on the equilibrium reached in a reaction.
Based on the quantum molecular dynamics picture, we aim to understand heavy-ion collisions in terms of participant spectator matter leading to various fragments of different sizes. The study is performed for symmetric as well as asymmetric reactions at E = 200 MeV nucleon −1 for central collisions. Our results highlight the importance of a phase space analysis of the fragment distribution in symmetric and asymmetric collisions in terms of light mass fragments that are a component of participant matter and intermediate mass fragments, which come from the spectator region.
The role of different parts of nucleon-nucleon (NN) interaction potential on the production of light and intermediate mass fragments in different mass asymmetric reactions 120 Sn + 120 Sn (η = 0), 82 Kr + 158 Gd (η = 0.3), 56 Fe + 184 W (η = 0.5) and 35 Cl + 205 Tl (η = 0.7) (with A total = 240 units) within different rapidity domains has been investigated using Isospin-dependent Quantum Molecular Dynamics (IQMD) model. The results indicate that the multiplicity of different fragments change with the gradual addition of different parts of NN interaction potential. The comparison between calculations and experimental data for 120 Sn + 120 Sn reaction reveal that both momentum dependent interactions (MDI) and symmetry potential are indispensable to explain the charge distribution. The MDI plays a dominant role while the symmetry potential has minor influence on the fragment production, but both together led to increase in the multiplicity of light and intermediate mass fragments and hence show their significance in the fragment production at intermediate energies.
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