The dynamics of the η → 3π 0 decay have been studied with the Crystal Ball multiphoton spectrometer and the TAPS calorimeter. Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for η-meson production. The analysis of 3 × 10 6 γp → ηp → 3π 0 p → 6γp events yields the value α = −0.032 ± 0.003 for the η → 3π 0 slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The π 0 π 0 invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the π + π − threshold. The observed effect is small and does not affect our measured value for the slope parameter.
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