SIMULTANEOUS MEASUREMENT OF K(S) AND K(L) DECAYS INTO PI+PI-GAMMA

With the E731 apparatus at Fermilab, we have simultaneously collected 6859 K(L) and K(S) decays into pi+pi-gamma. Using our sample of over 370000 pi+pi- decays for normalization we have determined that the ratio GAMMA(K0 --> pi+pi-gamma)/GAMMA(K0 --> pi+pi-) is (23.0 +/- 0.7) x 10(-3) for K(L) and (7.10 +/- 0.22) x 10(-3) for K(S), for photon energies greater than 20 MeV in the kaon center of mass. After removing the inner-bremsstrahlung contribution, we find that the photon energy spectrum of the direct emission decay of the K(L) is consistent with the presence of a vector meson propagator in the form factor.