Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

摘要: A dispersive-optical-model analysis of p+{sup 40,42,44,48}Ca and n+{sup 40}Ca interactions has been carried out. The real imaginary potentials have constrained by fitting elastic-scattering data, total reaction cross sections, level properties valence hole states deduced from (e,e{sup '}p) data. resulting surface potential increases with asymmetry for protons, implying that in heavier Ca isotopes, protons experience stronger long-range correlations. Presently, there is not enough data neutrons to determine their dependence. Global optical-model fits usually assume the neutron dependence equal magnitude, but opposite sign, protons. Such a was found give unphysical results heavy isotopes. dispersive optical model shown be useful tool data-driven extrapolations drip lines. Neutron proton at larger asymmetries are needed achieve more reliable extrapolations. present predicts {sup 60}Ca 70}Ca bound, while intermediate isotopes not.