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Oki Island is located between Japan and Korea along the Tokai-To-Kamioka(T2K) baseline. The distance from J-PARC to Oki Island is about 653km, which istwice that of the T2K experiment (L=295km). When the off-axis angle of theneutrino beam from J-PARC is 3.0^\circ (2.0^\circ) at Super-Kamiokande (SK),the off-axis beam (OAB) with 1.4^\circ (0.6^\circ) reaches at Oki Island. Weexamine physics case of placing a far detector in Oki Island during the T2Kexperimental period. We estimate the matter density profile along theTokai-to-Oki baseline by using recent seismological measurements. For adetector of 100kton fiducial volume and 2.5x10^21 POT (protons on target)exposure for both \nu_\mu and \bar{\nu}_\mu beams, we find that the masshierarchy pattern can be distinguished at 3\sigma level if sin^22theta_rct\equiv 4|U_{e3}|^2(1-|U_{e3}|^2) \gsim 0.09, by observing the electron-likeCCQE (Charged-Current Quasi Elastic) events. The CP phase in theMaki-Nakagawa-Sakata lepton flavor mixing matrix, \delta_mns, can beconstrained with \pm 20^\circ. As a reference, we repeat the same analysis byplacing the same detector in Korea at L=1000km and OAB=0.5^\circ (T2KK) andalso by placing it at the SK site (T2K_122). The Tokai-to-Kamioka-OKI (T2KO)sensitivity to the mass hierarchy is about 1/3 (in \Delta \chi^2_min) of T2KK,while the sensitivity to the phase \delta_mns is similar between T2KO and T2KK.The T2K_122 option has almost no sensitivity to the mass hierarchy, and cannotmeasure the CP phase except when \delta_mns \sim -90^\circ (90^\circ) for thenormal (inverted) hierarchy.

Physics potential of neutrino oscillation experiment with a far detector in Oki Island along the T2K baseline