Neutron−90Zr mean field from a dispersive optical model analysis

Elastic scattering cross sections have been measured for 8, 10, and 24 MeV neutrons incident on ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$. These measurements, together with other neutron elastic scattering and total cross section data available up to 29 MeV, are used in grid searches to obtain an optical model potential which contains a dispersion relation term. This potential is then extrapolated toward negative energies to predict bound single-particle state properties. An overall good description of the data at positive and negative energies is achieved.