Supriya Goyal

Study of fragmentation using clusterization algorithm with realistic binding energies

We here study fragmentation using a simulated annealing clusterization algorithm (SACA) with binding energy at a microscopic level. In an earlier version, a constant binding energy (4 MeV/nucleon) was used. We improve this binding energy criterion by calculating the binding energy of different clusters using a modified Bethe–Weizsacker mass (BWM) formula. We also compare our calculations with experimental data of the ALADiN group. Nearly no effect of this modification is visible.

Momentum dependence of the nuclear mean field and multifragmentation in heavy-ion collisions

We report the consequences of implementing momentum dependent interactions (MDI) on multifragmentation in heavy-ion reactions over entire collision geometry. The evolution of a single cold nucleus using static soft and soft momentum dependent equations of state demonstrates that inclusion of momentum dependence increases the emission of free nucleons. However, no heavier fragments are emitted artificially. The calculations performed within the framework of quantum molecular dynamics approach suggest that MDI strongly influence the system size dependence of fragment production. A comparison with ALADiN experimental data justifies the use of momentum dependent interactions in heavy-ion collisions.

On the sensitivity of the energy of vanishing flow towards mass asymmetry of colliding nuclei

Abstract We demonstrate the role of the mass asymmetry in the energy of vanishing flow by studying asymmetric reactions throughout the periodic table and over entire colliding geometry. Our results, which are almost independent of the system size and as well as of the colliding geometries indicate a sizable effect of the asymmetry of the reaction on the energy of vanishing flow.

Role of colliding geometry on the balance energy of mass-asymmetric systems

We study the role of colliding geometry on the balance energy (E{sub bal}) of mass-asymmetric systems by varying the mass asymmetry ({eta} =A{sub T}-A{sub p}/A{sub T}+A{sub P}, where A{sub T} and A{sub P} are the masses of the target and projectile, respectively) from 0.1 to 0.7, over the mass range 40-240 and on the mass dependence of the balance energy. Our findings reveal that colliding geometry has a significant effect on the E{sub bal} of asymmetric systems. We find that, as we go from central collisions to peripheral ones, the effect of mass asymmetry on E{sub bal} increases throughout the mass range. Interestingly, we find that for every fixed system mass (A{sub tot}) the effect of the impact parameter variation is almost uniform throughout the mass-asymmetry range. For each {eta}, E{sub bal} follows a power-law behavior ({proportional_to}A{sup {tau}}) at all colliding geometries.

Role of the mass asymmetry of reaction on the geometry of vanishing flow

Abstract We study the transverse flow throughout the mass asymmetry range as a function of the impact parameter, keeping the total mass of the system fixed. We find that the geometry of vanishing flow (GVF) i.e. the impact parameter at which flow vanishes and its mass dependence is quite sensitive to the mass asymmetry of the reaction. With increase in the mass asymmetry, the value of GVF decreases, while its mass dependence increases. Our results indicate the sizable role of mass asymmetry on GVF as on balance energy.

Effect of mass asymmetry on the mass dependence of balance energy

We demonstrate the role of the mass asymmetry on the balance energy (Ebal) by studying asymmetric reactions throughout the periodic table and over entire colliding geometry. Our results, which are almost independent of the system size and as well as of the colliding geometries indicate a sizeable effect of the asymmetry of the reaction on the balance energy.