Measurement of beam energy dependent nuclear modification factors at STAR

The nuclear modification factors R_AA and R_CP have been used to measure medium-induced suppression in heavy-ion collisions at = 200 GeV which was among the earliest evidence for the existence of a strongly interacting medium called a quark-gluon plasma (QGP). Nuclear modification factors for asymmetric collisions (R_dA) have measured the Cronin Effect, an enhancement of high transverse momentum particle yields in deuteron-gold collisions relative to proton-proton collisions. A similar enhancement is observed in data presented in these proceedings and competes with the quenching caused by partonic energy loss in the QGP. In these proceedings we will present charged-hadron R_CP at mid-rapidity for = 7.7 – 62.4 GeV as well as identified π⁺, K⁺, and p R_CP. Comparisons to HIJING motivate possible methods for disentangling competing modifications to nuclear transverse momentum spectra.