Abstract
Resonance structure in the $^{28}+\mathrm{n}$ system has been investigated by performing neutron total cross section and capture \ensuremath{\gamma}-ray measurements. A detailed analysis of resonance parameters was carried out up to a neutron energy of 2.75 MeV. Level densities were determined for s- and p-wave resonances, as well as neutron strength functions and partial radiative widths. The neutron strengths are compared with existing model calculations. The neutron width of at least one T=(3/2 level has been determined, providing a measure of isobaric spin mixing. Whereas other workers previously reported a strong correlation between the reduced neutron widths (${\ensuremath{\Gamma}}_{\mathrm{n}{}^{l}}$) and total radiative widths, we observe no significant correlation between ${\ensuremath{\Gamma}}_{\mathrm{n}{}^{l}}$ and the partial radiative widths for ground state transitions. We conclude that radiative capture in $^{28}+\mathrm{n}$ does not proceed via a simple valence mechanism, but must involve several competing doorway states. The observed M1 strength in $^{29}\mathrm{Si}$ is lower than that reported for $^{28}\mathrm{Si}$ from inelastic electron scattering, suggesting either a considerable fragmentation or a significant reduction due to the presence of the additional neutron.
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