Photoionization of Xe4+ to Xe7+ ions was studied by combining an electron cyclotron resonance ion source with synchrotron radiation. Multiconfiguration Dirac-Fock calculations were performed to interpret the data. Many autoionization lines were measured and identified, resulting from excitation of a 4d electron into nf and np orbitals followed by Auger decay of the excited states. Continuum photoionization is negligible for the higher members of the isonuclear series.
Measurements of elastic and inelastic scattering cross sections have been performed for 2.5 and 4.1 MeV neutrons incident on 155,156,157,158,160 Gd. Angular distributions have been measured at both energies for the 0 ϩ , 2 ϩ , and 4 ϩ members of the ground-state ͑gs͒ band of the even-even isotopes and for the 3/2 Ϫ , 5/2 Ϫ , and 7/2 Ϫ levels of the gs band of the even-odd isotopes. Angular distributions for inelastic scattering from the 9/2 Ϫ level of the gs band of 155 Gd and 157 Gd have also been measured at 4.1 MeV. These results together with previously measured s-and p-wave strength functions, potential scattering radii, and elemental total cross sections have been combined in an analysis based on coupled-channel semimicroscopic optical model potential ͑OMP͒ and statistical model calculations. The deformed OMP, an extension of our earlier work ͓E. Bauge, J.P. Delaroche, and M. Girod, Phys. Rev. C 48, 1118 ͑1998͔͒, is built using a complex density-dependent effective interaction and deformed matter densities deduced from unconstrained, axially symmetric Hartree-Fock-Bogoliubov ͑HFB͒ calculations based on the Gogny force. The HFB calculations which describe quite nicely a wealth of results from electron scattering and Coulomb excitations measurements, lead to semimicroscopic OMP predictions in good agreement with the neutron scattering and reaction measurements. A phenomenological OMP analysis is also performed to compare the global properties of both potentials.
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