2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197671The effects of opacity of the nuclei together with a blackbody type of emission along the system history are considered as a means to explain the ratio $R_{out}/R_{sid}$ observed by STAR and PHENIX collaborations at RHIC. Within our model, no flow is required to explain the data trend of this ratio for large surface emissivities.4 pages, 2 Postscript figures, uses espcrc1.sty. Talk presented at Quark Matter 2002, Nantes, France, July 18-24, 2002; to appear in the proceedings (Nucl. Phys. A)Nuclear TheoryHigh Energy Physics - PhenomenologyNuclear Experimenttext