Anti-halo effects on reaction cross sections for 14,15,16C isotopes
Abstract
We study anti-halo effects on reaction cross sections σ R for 14,15,16C scattering from a 12C target at 83~MeV/nucleon, using the g-matrix double-folding model. 15C is described by the 14C~+~n two-body model that reproduces the measured large s-wave spectroscopic factor, i.e., the shell inversion that the 1s1/2 orbital is lower than the 0d5/2 orbital in energy. 16C is described by the 14C~+~n~+~n three-body model with the phenomenological three-body force (3BF) that explains the measured small s-wave spectroscopic factor. The 3BF allows the single-particle energies of the 14C + n subsystem to depend on the position r of the second neutron from the center of mass of the subsystem. The 1s1/2 orbital is lower than the 0d5/2 orbital for large r, but the shell inversion is restored for small r. Anti-halo effects due to the "partial shell inversion" make σ R for 16C smaller than that for 15C. We also investigate projectile breakup effects on the mass-number dependence of σ R with the continuum discretized coupled-channels method.
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