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Using a minimal model of active Brownian particles, we study the effect of a crucial parameter, namely the softness of the interparticle repulsion, on motility-induced phase separation. We show that an increase in particle softness reduces the ability of the system to phase separate and the system exhibits a delayed transition. After phase separation, the system state properties can be explained by a single relevant length scale, the effective interparticle distance. We estimate this length scale analytically and use it to rescale the state properties at dense phase for systems with different interaction softness. Using this length scale, we provide a scaling relation for the time taken to phase separate which shows a high sensitivity to the interaction softness.
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