Neutron-proton equilibration in 35 MeV/u collisions of 64,70Zn + 64,70Zn and 64Zn,64Ni + 64Zn,64Ni quantified using triplicate probes

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Abstract

Previous work has quantified the degree of neutron-proton equilibration in heavy-ion nuclear collisions by observing the convergence of isospin observables (such as the isoscaling parameter $\ensuremath{\alpha}$) to an expected value based on similar symmetric reaction systems. We present a new signature of equilibration: the convergence of the isospin asymmetry (as quantified by three isoscaling metrics) of two mirror asymmetric reaction systems toward each other rather than a predefined point. For the reactions of 35 MeV/$u$ $^{64,70}\mathrm{Zn}+^{64,70}\mathrm{Zn}$ and $^{64}\mathrm{Zn},^{64}\mathrm{Ni}+^{64}\mathrm{Zn},^{64}\mathrm{Ni}$ the neutron-proton equilibration was found to be approximately 80%, and this result is compared directly to previous work.

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