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We argue that a decrease of the chiral scalar meson mass is responsible forre-creation of $\Psi'$ from $J/\Psi$ in ultrarelativistic nucleus-nucleuscollisions. This causes the charmonium yields to freeze out at temperaturesclose to the chiral symmetry restoration temperature $T_c$. As a result$\Psi'/\Psi$ may serve as a thermometer for $T_c$ itself. Results in a detailedreaction model support the conjecture. They show good agreement with recentdata of NA38 and NA50 for $J/\Psi$ and $\Psi'$ production in S on U and Pb onPb collisions.Comment: 4 pages revtex including 3 postscript figure

physical review letters

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Ψ</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>/</mml:mi><mml:mi>Ψ</mml:mi></mml:math>Ratio in Nucleus-Nucleus Collisions: A Measure for the Chiral Symmetry Restoration Temperature?

Ψ′/ΨRatio in Nucleus-Nucleus Collisions: A Measure for the Chiral Symmetry Restoration Temperature?