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The PHENIX experiment at the Relativistic Heavy Ion Collider measured $\pi^0$and $\eta$ mesons at midrapidity in U$+$U collisions at $\sqrt{s_{_{NN}}}=192$GeV in a wide transverse momentum range. Measurements were performed in the$\pi^0(\eta)\rightarrow\gamma\gamma$ decay modes. A strong suppression of$\pi^0$ and $\eta$ meson production at high transverse momentum was observed incentral U$+$U collisions relative to binary scaled $p$$+$$p$ results. Yields of$\pi^0$ and $\eta$ mesons measured in U$+$U collisions show similar suppressionpattern to the ones measured in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$GeV for similar numbers of participant nucleons. The $\eta$/$\pi^0$ ratios donot show dependence on centrality or transverse momentum, and are consistentwith previously measured values in hadron-hadron, hadron-nucleus,nucleus-nucleus, and $e^+e^-$ collisions.

Production of $\pi^0$ and $\eta$ mesons in U$+$U collisions at $\sqrt{s_{_{NN}}}=192$ GeV