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The CELSIUS/WASA setup is used to measure the 3pi0 decay of eta mesonsproduced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV.The efficiency-corrected Dalitz plot and density distributions for this decayare shown, together with a fit of the quadratic slope parameter alpha yieldingalpha = -0.026 +/- 0.010(stat) +/- 0.010(syst). This value is compared torecent experimental results and theoretical predictions.

Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction