We calculate the semi-inclusive decay rate of an average string state with
toroidal compactification in the the superstring theory. We also apply this
calculation to a brane-inflation model in a warped geometry and find that the
decay rate is greatly suppressed if the final strings are both massive and
enhanced for massless radiation.Comment: 4 pages, to appear in the proceeding of PASCOS 2005, Gyeongju, Korea,
May 30-June 4, 200
