Preliminary results on KL->pi e nu(gamma) decays collected by the NA48
detector at the CERN SPS are reported. Using a sample of 6.8 X 10^6
reconstructed events BR(Ke3) = 0.4010+-0.0028+-0.0035 was obtained. From the
branching ratio the value of |Vus|= 0.2187+-0.0028 was extracted. The same data
sample has provided also a high precision measurement of the slope lambda+ of
the form factor of the Ke3 decay. Investigating the Ke3gamma decay, from a
sample of 18977 reconstructed events, BR(Ke3gamma)/BR(Ke3) =
(0.964+-0.008+0.012-0.011)% was determined.Comment: 4 pages, 2 figures. To appear in the proceedings of the Vth
Rencontres du Vietnam, Particle Physics and Astrophysics, Hanoi, Vietnam,
August 5-11, 200
