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

Abstract

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 $L=0$ 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 ($2{p}_{\frac{1}{2}}$) 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 ${3}^{\ensuremath{-}}$ based states are severely mixed with single particle levels and perhaps with other elementary modes of excitation as well.NUCLEAR REACTIONS $^{103}\mathrm{Rh}$, $^{106,108}\mathrm{Pd}$, $^{107,109}\mathrm{Ag}(t, p)$, $E(t)=17.0$ MeV, magnetic spectrograph, enriched targets; measured $\ensuremath{\sigma}(\ensuremath{\theta}, {E}_{p})$, excitation energies, DWBA analysis; $^{105}\mathrm{Rh}$, $^{108,110}\mathrm{Pd}$, $^{109,111}\mathrm{Ag}$ deduced $L$, $J$, $\ensuremath{\pi}$, enhancement factors; weak coupling model.