In our previous work, we determined matter radii rm​(exp) and
neutron-skin thickness rskin​(exp) from reaction cross sections
σR​(exp) of proton scattering on 208Pb, 58Ni,
40,48Ca, 12C 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 rskin​(exp) agree with
the PREX2 and CREX values. As for 58Ni, our value is consistent with one
determined from the differential cross section for 58Ni+4He
scattering. As for p+60,62,64N scattering, σR​(exp) are
available as a function of incident energies Ein​, where Ein​=22.8∼65.5~MeV for 60Ni, Ein​=40,60.8~MeV for 62Ni,
Ein​=40,60.8~MeV for 64Ni. Our aim is to determine matter radii
rm​(exp) for 60,62,64Ni from the σR​(exp). Our method is the Kyushu g-matrix folding model with the densities
scaled from D1S-GHFB+AMP densities, Our skin values are rskin​(exp)=0.076±0.019, 0.106±0.192, 0.162±0.176~fm, and rm​(exp)=3.759±0.011, 3.811±0.107, 3.864±0.101~fm for
60,62,64Ni, respectively