Low-Lying Excited States ofAg108andAg110Populated in Thermal-Neutron-Capture Reactions

The thermal-neutron-capture $\gamma$-ray spectra following the reactions ${\mathrm{Ag}}^{107}(n, \gamma ){\mathrm{Ag}}^{108}$ and ${\mathrm{Ag}}^{109}(n, \gamma ){\mathrm{Ag}}^{110}$ were studied with the aid of a Ge(Li) detector operated in the singles and pair-spectrometer modes. The use of isotopically enriched targets led to unambiguous assignments of 33 primary transitions in ${\mathrm{Ag}}^{108}$ and 46 transitions issuing from the capture state in ${\mathrm{Ag}}^{110}$. In each nuclide, these transitions were used to define the low-lying states to an accuracy of ∼±1 keV up to an excitation energy of ∼1300 keV. The observed strengths of the primary transitions are examined to determine the possible presence of systematic regularities of the type reported in the rare-earth rotational region. Comparisons are made between these data and previous ($d, p$) studies with a view toward establishment of the parity of the states populated in both reactions.