Improved branching ratios were measured for the KL​→3π0 decay in a
neutral beam at the CERN SPS with the NA31 detector: Γ(KL​→3π0)/Γ(KL​→π+π−π0)=1.611±0.037 and Γ(KL​→3π0)/Γ(KL​→πeν)=0.545±0.010.
From the first number an upper limit for ΔI=5/2 and ΔI=7/2 transitions in neutral kaon decay is derived. Using older results for the
Ke3/Kμ3 fraction, the 3π0 branching ratio is found to be Γ(KL​→3π0)/Γtot​=(0.211±0.003), about a factor three more
precise than from previous experiments