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We first predict the ground-state properties of Ca isotopes, using theGogny-D1S Hartree-Fock-Bogoliubov (GHFB) with and without the angular momentumprojection (AMP). We find that $^{64}$Ca is an even-dripline nucleus and$^{59}$Ca is an odd-dripline nucleus, using $A$ dependence of the one-neutronseparation energy $S_{1}$ and the two-neutron separation energy, $S_{2}$. Asfor $S_{1}$, $S_{2}$ and the binding energies $E_{\rm B}$, our results agreewith the experimental data in $^{40-58}$Ca. As other ground-state properties of$^{40-60,62,64}$Ca, we predict charge, proton, neutron, matter radii, neutronskin and deformation. As for charge radii, our results are consistent with theexperimental data in $^{40-52}$Ca. For $^{48}$Ca, our results on proton,neutron, matter radii agree with the experimental data. Very lately, Tanaka et.al. measured interaction cross sections for $^{42-51}$Ca scattering on a$^{12}$C target at an incident energy per nucleon of $E_{\rm lab}=280$MeV.Secondly, we predict reaction cross sections $\sigma_{\rm R}$ for$^{40-60,62,64}$Ca, using a chiral $g$-matrix double-folding model (DFM). Toshow the reliability of the present DFM for $\sigma_{\rm R}$, we apply the DFMfor the data on $^{12}$C scattering on $^{9}$Be, $^{12}$C, $^{27}$Al targets in$30 < E_{\rm lab} < 400 $MeV, and show that the present DFM is good in $30 <E_{\rm lab} < 100 $MeV and $250 < E_{\rm lab} < 400 $MeV. For $110 < E_{\rmlab} < 240 $MeV, our results have small errors. To improve the present DFM for$\sigma_{\rm R}$, we propose two prescriptions.

$g$-matrix folding-model approach to reaction cross sections for scattering of Ca isotopes on a C target