Neutron Asymmetry Parameterization of a Dispersive Optical Model

We have recently applied a Dispersive Optical Model (DOM) analysis to a series of calcium isotopes. The proton spectroscopic factors as a function of asymmetry were determined, but the neutron dependence on asymmetry was not. Consideration of either Gamow-Teller or collective E2 strength yield different asymmetry dependencies (for neutrons) than the global OM parameterizations. Neutron elastic scattering n+48Ca can distinguish between these possibilities. With such data, extrapolation of neutron spectroscopic factors towards the n-drip line will be more robust.