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The first dedicated search for the rare neutral-kaon decay$K_L^0\to\pi^0\nu\bar{\nu}$ has been carried out in the E391a experiment at theKEK 12-GeV proton synchrotron. The final upper limit of 2.6 $\times 10^{-8}$ atthe 90% confidence level was set on the branching ratio for the decay.

Experimental study of the decay $K_L^0\to\pi^0\nu\bar{\nu}$