  Configurational information entropy (CIE) theory was employed to determine
the neutron skin thickness of neutron-rich calcium isotopes. The nuclear
density distributions and fragment cross-sections in 350 MeV/u $^{40-60}$Ca +
$^{9}$Be projectile fragmentation reactions were calculated using a modified
statistical abrasion-ablation model. CIE quantities were determined from the
nuclear density, isotopic, mass, and charge distributions. The linear
correlations between the CIE determined using the isotopic, mass, and charge
distributions and the neutron skin thickness of the projectile nucleus show
that CIE provides new methods to extract the neutron skin thickness of
neutron-rich nuclei.
