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We demonstrate that the classical helium atom exhibits algebraic decay of the survival probability in the autoionizing {\it eZe} configuration. Excitation towards asymptotic orbits of marginal stability is identified as the cause of the nonexponential decay. Since one electron travels along a bound Kepler trajectory of infinite excitation in these orbits, we argue that the classical decay law will prevail in the quantum dynamics of a wave packet launched along the {\it eZe} configuration.

Algebraic decay of the survival probability in chaotic helium