Effects of the Leptonic CP violating phase,\delta, on 3 generation neutrino
oscillation rates and asymmetries are discussed. A figure of merit argument is
used to show that our ability to measure the phase \delta is rather insensitive
to the value of \theta_{13} (for \sin^22\theta_{13}\gsim0.01) as well as the
detector distance (for very long oscillation baselines). Using a study of
\nu_\mu\to\nu_e oscillations for BNL-Homestake (2540 km) we show that a
conventional horn focused wide band neutrino beam generated by an intense 1-2
MW proton source combined with a very large water Cherenkov detector (250-500
kton) should be able to determine \delta to about \pm 15^\circin5×107secofrunning.Inaddition,suchaneffortwouldalsomeasuretheotheroscillationparameters(θij,Δmij2)withhighprecision.SimilarfindingsapplytoaFermilab−Homestake(1280km)baseline.WealsobrieflydiscussfeaturesofSuperbeams,NeutrinoFactoriesandBeta−Beams.Comment:7pages, Figures, to be published in Neutrino2006 Proceeding