The one- or two-neutron removal reactions as well as reaction cross sections for 14,15C on carbon target have been studied by using 1104 MeV 22Ne primary beam on Riken Projectile Fragment Separator in RIKEN. The longitudinal momentum distributions of 13,14C fragments from 15C and 13C fragments from 14C breakup have been measured at 83A MeV by means of direct time-of-flight method. Full width at half maximum (FWHM) of the distributions have been determined to be 71±9 MeV/c and 223±28 MeV/c for 14C and 13C from 15C, and 195±21 MeV/c for 13C from 14C. The FWHM for 13C fragments from 15C and 14C breakup are consistent with the Goldhaber model's prediction. While the FWHM of 14C fragments from 15C is much smaller, which confirms the experimental results from MSU and GANIL, an anomalous enhancement from its neighbors has been observed in the measured reaction cross section of 15C. The experimental data are discussed in the framework of the Glauber model. The analysis of both the fragment momentum distributions and reaction cross sections indicates a dominant s-wave component in the ground state of 15C.
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