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We have detected the submillimeter-wave fine-structure transition (3P1-3P0)of 13C, [13C I], in the gaseous debris disk of 49 Ceti with the Atacama LargeMillimeter/submillimeter Array (ALMA). Recently, the [C I] 3P1-3P0 emission hasbeen spatially resolved in this source with ALMA. In this dataset, theF=3/2-1/2 hyperfine component of [13C I], which is blue-shifted by 2.2 km/sfrom the normal species line, [C I], has been identified in the outer part ofthe 49 Ceti disk, thanks to the narrow velocity widths of the gas components.The [C I]/[13C I] line intensity ratio is found to be 12+-3, which is aboutone-fifth of the 12C/13C abundance ratio of 77 in the interstellar medium. Thisresult clearly reveals that the [C I] emission is optically thick in 49 Ceti atleast partly, as speculated by the previous work. As far as we know, this isthe first detection of [13C I] 3P1-3P0 emission at 492 GHz not only in debrisdisks but also in the interstellar medium.

First detection of submillimeter-wave [13C I] 3P1-3P0 emission in a gaseous debris disk of 49 Ceti with ALMA