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Assuming that alpha particles are described by a scalar-isoscalar chiralinvariant heavy field it is shown how chiral symmetry determines thealpha-alpha interaction at long distances unambiguously from dimensional powercounting of an effective chiral Lagrangean. The leading strong contribution isgiven by a two pion exchange potential which turns out to be attractive andsingular at the origin, hence demanding renormalization. When 8Be is treated asa resonance state a model independent correlation between the Q-factor andlifetime 1/Gamma for the decay into two alpha particles arises. For parameterscompatible with potential model analyses of low energy pi-alpha scattering itis found a Breit-Wigner width Gamma = 4.3(3) eV very close to the experimentalvalue, Gamma= 5.57 (25)eV.

Alpha-alpha interaction with chiral two pion exchange and 8Be lifetime