Coulomb Displacement Energies Derived from thep,nIsobaric Reaction

Abstract
The agreement of Coulomb displacement energies derived from the nonmirror (p,n) isobaric reaction with those obtained from mirror and nonmirror (T=1) nuclei beta decay has been previously demonstrated. Using the Livermore 90-in. cyclotron time-of-flight facility, we have measured additional Coulomb displacement energies in the mass region 70A108. These measurements indicate possible shell effects which were previously not observed because of the paucity of data. With the availability of 20.5-MeV protons, Coulomb displacement energy measurements were extended to the mass region A165. Even for nuclei as heavy as Ho165, where the Coulomb displacement energy is 16.6 MeV, the width of the isobaric neutron group was not measurable (≤150 keV). The variation of the uniform radius parameter with atomic weight (A) inferred from these data is compared with that obtained from high-energy electron scattering experiments and is found to be in substantial agreement. A semiempirical formula for calculating Coulomb displacement energies is presented.

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