The Nuclear Equation of State (NEOS) guides the dynamics of heavy-ion collisions and can thus be studied through these dynamics. Neutron-proton equilibration is one process which has been used to study the density dependence of the symmetry energy term in the NEOS. Experimental analysis of the process requires theoretical input regarding the time dependency of the angular alignment, α, an angle used to assess the angle of rotation of a projectile-like fragment after separating from a target nucleus. This study utilizes molecular dynamics simulations of 70Zn + 70Zn with collision energies of 35 and 45 MeV/nucleon to study this correlation. An algorithm is proposed which searches through simulated events and identifies the excited projectile-like fragment (PLF*) after its separates from the target and determines its lifetime, Δt. It also determines the fragments that the PLF* breaks apart into and determines their angular alignment. This technique gives an opportunity to determine how the average contribution of dynamic yield, &lt;α&gt;dyn, evolves with PLF* lifetime. A roughly linear relationship was determined, indicating a correlation with magnitude consistent with classically determined values used for prior experimental results.

Time dependency of angular alignment in simulated heavy-ion collisions

ACS Fall 2021

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