Abstract
In this talk, we show the physics impacts of putting a 100kt‐level Water Cerenkov detector in Korea during the T2K experimental period. The T2K experiment which will start in 2009 plans to use the high intensity conventional neutrino beam from J‐PARC at Tokai village, Japan. The center of this beam will reach the sea level between Japan and Korea, and an off‐axis beam at 0.5° to 1.0° can be observed in Korea. For a combination of the 3° off‐axis beam at SK with baseline length L = 295km and the 0.5° off‐axis beam in the east coast of Korea, near Gyeongju, at L = 1000km, we find that the neutrino mass hierarchy (the sign of the larger mass‐squared difference) can be resolved and the CP phase of the MNS unitary matrix can be constrained uniquely at 3‐σ level when sin2 2θrct ≳ 0.06.
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