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Distribution of the parallel momentum of 28Si fragments from the breakup of 30. 7MeV/nucleon 29P has been meesured on C targets. The distribution has the F WHM with the value of 110.5 ± 23.5 MeV/c, which is quantita tively consistent with the Galuber model calculation assuming by a valence proton in 29P. The density distribution is also predicted by the Skyrme-Hartree-Fock calculation. The results show that the proton-skin structure may exist in 29 P.