  We study, in a pQCD calculation augmented by nuclear effects, the jet energy
loss needed to reproduce the pi^0 spectra in Au+Au collisions at large p_T,
measured by PHENIX at RHIC. The transverse width of the parton momentum
distributions (intrinsic-k_T) is used phenomenologically to obtain a reliable
baseline pp result. Jet quenching is applied to the nuclear spectra (including
shadowing and multiscattering) to fit the data.
