  In our previous work, we determined matter radii $r_{\rm m}({\rm exp})$ and
neutron-skin thickness $r_{\rm skin}({\rm exp})$ from reaction cross sections
$\sigma_{\rm R}({\rm exp})$ of proton scattering on $^{208}$Pb, $^{58}$Ni,
$^{40,48}$Ca, $^{12}$C targets, using the chiral (Kyushu) $g$-matrix folding
model with the densities calculated with Gogny-D1S-HFB (D1S-GHFB) with angular
momentum projection (AMP). The resultant $r_{\rm skin}({\rm exp})$ agree with
the PREX2 and CREX values. As for $^{58}$Ni, our value is consistent with one
determined from the differential cross section for $^{58}$Ni+$^{4}$He
scattering. As for p+$^{60,62,64}$N scattering, $\sigma_{\rm R}({\rm exp})$ are
available as a function of incident energies $E_{\rm in}$, where $E_{\rm
in}=22.8 \sim 65.5$~MeV for $^{60}$Ni, $E_{\rm in}=40,60.8$~MeV for $^{62}$Ni,
$E_{\rm in}=40, 60.8$~MeV for $^{64}$Ni. Our aim is to determine matter radii
$r_{\rm m}({\rm exp})$ for $^{60,62,64}$Ni from the $\sigma_{\rm R}({\rm
exp})$. Our method is the Kyushu $g$-matrix folding model with the densities
scaled from D1S-GHFB+AMP densities, Our skin values are $r_{\rm skin}({\rm
exp})=0.076 \pm 0.019,~0.106 \pm 0.192,~0.162 \pm 0.176$~fm, and $r_{\rm
m}({\rm exp})=3.759 \pm 0.011,~3.811 \pm 0.107,~3.864 \pm 0.101$~fm for
$^{60,62,64}$Ni, respectively.
