We extensively study the system size dependence of nuclear collisions with a multiphase transport model. Previously, certain key parameters for the initial condition needed significantly different values for pp and central AA collisions for the model to reasonably describe the yields and transverse momentum spectra of the bulk matter in those collision systems. Here we scale two key parameters, the Lund string fragmentation parameter bL and the minijet transverse momentum cutoff p0 , with local nuclear thickness functions from the two colliding...
