Cross sections for elastic scattering of neutrons from ⁴⁰Ca have been measured at 30.3 and 40.0 MeV and analyzed to obtain optical-model potentials. The optical potentials for neutron and proton scattering are found to be very similar after a correction for Coulomb effects, indicating that a static charge-symmetry-breaking Hartree potential is too small to explain the Coulomb-energy anomaly for bound states.
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DeVito et al. (1981) studied this question.
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