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We develop a Bose fluid model in a confined potential to consider the newquantum phase due to the localization of Bose-Einstein condensation anddisappearance of superfluidity which is recently observed in liquid 4He inporous glass at high pressures. A critical pressure of the transition to thisphase can be defined by our new analytical criterion of supposing the size oflocalized Bose-Einstein condensate becomes comparable to the scale ofconfinement. The critical pressure is quantitatively consistent withobservations without free parameters.Comment: 2 pages, 1 figur

Localization of Bose-Einstein Condensate and Disappearance of Superfluidity of Strongly Correlated Bose Fluid in a Confined Potential