Nuclear dynamics of 192Os as probed in neutron scattering.

Abstract

This paper is part of an extensive survey of neutron scattering from nuclei in the Os-Pt transition region. We present neutron differential scattering cross sections from $^{192}\mathrm{Os}$ measured at 1.60, 2.52, and 3.94 MeV, as well as neutron total cross sections measured between 250 keV and 4.2 MeV. These data are analyzed via coupled-channels models to extract nuclear structure information; the cross sections are found to be quite sensitive to the relative signs and magnitudes of the reduced matrix elements that couple the scattering channels. We find that nuclear excitation amplitudes from our neutron scattering data are in good agreement with results from Coulomb excitation experiments, in contrast to earlier findings for $^{194}\mathrm{Pt}$. Neutron scattering cross sections to $^{192}\mathrm{Os}$ are best described by models that depict $^{192}\mathrm{Os}$ as a \ensuremath{\gamma}-soft vibrator; they cannot be described with \ensuremath{\gamma}-rigid models. The neutron energy dependence of the strength of the real scattering potential is consistent only with mean-scattering fields whose energy dependencies reflect the dispersion relations which connect the real and imaginary parts of the scattering potential.