Abstract
Level densities up close to the neutron binding energy have been extracted from primary $\ensuremath{\gamma}$ spectra for $^{56,57}\mathrm{Fe}$ and $^{96,97}\mathrm{Mo}$ nuclei using $(^{3}\mathrm{He},\ensuremath{\alpha}\ensuremath{\gamma})$ and $(^{3}\mathrm{He},^{3}\mathrm{He}\ensuremath{'}\ensuremath{\gamma})$ reactions on $^{57}\mathrm{Fe}$ and $^{97}\mathrm{Mo}$ targets. It is shown that statistical spectroscopy provides a useful tool in this mass region. Apparent step structures in the level-density curves are tentatively explained by a schematic microscopic model comprising single-particle level spacings and seniority-conserving and seniority-nonconserving interactions.
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