Abstract
We study the effects of system size on the neutron to proton ratio dependence of the energy of vanishing flow for isotopic series of various colliding nuclei. We find a significant effect of the nuclear symmetry energy on the neutron to proton ratio depen- dence of the energy of vanishing flow throughout the mass range for central as well as peripheral collisions. We find that the neutron to proton ratio dependence of the energy of vanishing flow for isotopic series of heavier system shows more sensitivity to the sym- metry energy compared to that for lighter systems and that this sensitivity is enhanced in peripheral collisions. In addition, the mass dependence of the energy of vanishing flow has also been studied for systems having a neutron to proton ratio varying from purely symmetric matter to a highly neutron-rich one.
Highlights
The investigation of system size effects in various phenomena of heavy-ion collisions has attracted a lot of attention
This is opposite to what has been observed for isobaric pairs, where the energy of vanishing flow (EVF) increases with an increase in neutron content and was attributed to the dominance of Coulomb repulsion for proton-rich colliding pairs
We have found that the change in the slope is more for heavier masses indicating that the N/Z dependence of the EVF for heavier systems can act as good probe to constrain the symmetry energy and its density dependence
Summary
The investigation of system size effects in various phenomena of heavy-ion collisions has attracted a lot of attention. System size dependencies have been reported for various phenomena like fusionfission, particle production, multifragmentation, collective flow (of nucleons/fragments) as well as its disappearance, for density and temperature and so on [1,2,3,4,5,6]. The collective transverse in-plane flow has been investigated extensively during the past three decades and has been found to depend strongly on the combined mass of the system [7] in addition to the incident energy [8, 9] as well as collision geometry [9]. Power law mass dependencies have been reported for various observables in nuclear dynamics such as density, temperature, and participant-spectator matter [6]
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