The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(epsilon'/epsilon) and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described

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The decay rate of K L → π 0 γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 K L → π 0 γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03 (stat) ± 0.03 (syst) ± 0.03 (norm) ) × 10 −6 and the vector coupling constant a v = −0.46 ± 0.03 (stat) ± 0.04 (syst) . This result suggests that the CP-violation effects are dominating in the K L → π 0 e + e − decay. An upper limit for the K L → π 0 γγ decay rate in the two photon mass region m γγ < m π 0 is also given.

Motivation 2 The Role of the MINOS 3 Possible Evolution of Neutrino Physics 4 Off-Axis NuMI Neutrino Beam 4.1 NuMI Off-Axis Neutrino Fluxes 4.2 4.3 Antineutrino Beams 4.4 Proton Economics 5 v/1 5.1 5.2 Possible 5.3 Background measurements and estimates; 5.4 Physics Potential of the NuMI Off-axis Beam 5.5 with JHF Phase I . . . . Future Evolution of the Off-Axis Neutrino '-'~.~~•.~

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