Excitation of particle-vibration multiplets in theA=110region by two-neutron stripping reactions

The ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}$, ${}_{}{}^{106,108}{}_{}{}^{}\mathrm{Pd}$, and ${}_{}{}^{107,109}{}_{}{}^{}\mathrm{Ag}(t, p)$ reactions have been studied at a bombarding energy of 17 MeV. Excitation energies and enhancement factors were obtained for a number of levels up to about 2.5 MeV excitation in the residual nuclei. The $L=0\mathrm{}$ transitions observed indicate that these nuclei are of a transitional character, though more closely resembling pairing rotational than pairing vibrational nuclei. The low-lying negative parity levels in the Ag nuclei appear to be well described as a ($2p_{\frac{1}{2}}$) proton weakly coupled to the appropriate core state in the even Pd cores. ${}_{}{}^{105}{}_{}{}^{}\mathrm{Rh}$ appears to display similar weak coupling characteristics. However, the higher-lying levels such as the $3^{-}$ based states are severely mixed with single particle levels and perhaps with other elementary modes of excitation as well.