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We have measured transverse momentum distributions of charged hadronsproduced in Au+Au collisions at sqrt(s_NN) = 62.4 GeV. The spectra arepresented for transverse momenta 0.25 < p_T< 4.5 GeV/c, in a pseudo-rapidityrange of 0.2 < eta < 1.4. The nuclear modification factor R_AA is calculatedrelative to p+p data at the same collision energy as a function of collisioncentrality. For p_T > 2 GeV/c, R_AA is found to be significantly larger than inAu+Au collisions at sqrt(s_NN) =130 and 200 GeV. In contrast, we find that theevolution of the invariant yields per participant pair from peripheral tocentral collisions is approximately energy independent over this range ofcollision energies. This observation challenges models of high p_T hadronsuppression in terms of parton energy loss.Comment: 5 pages, 3 figures, submitted to PR

physical review letters

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Centrality Dependence of Charged Hadron Transverse Momentum Spectra inAu+AuCollisions fromsNN