Lifetimes in 103Rh, 107Ag and 109Ag measured by the recoil-distance technique

The lifetimes of the lowest $\text{3}\text{2}{}^{\mathrm{?}}\text{and}\text{5}\text{2}{}^{\mathrm{?}}$ levels in ¹⁰³Rh, ¹⁰⁷Ag and ¹⁰⁹Ag have been measured with the Doppler-shift version of the recoil-distance technique. A beam of ³⁵Cl ions of energy 64 MeV was used to Coulomb excite the target nuclei and eject them from the target. The following lifetimes were obtained: $\text{τ(}{}^{103}\text{Rh}\text{,}\text{3}\text{2}{}^{\mathrm{?}}\text{, 295}\text{keV}\text{) = 14.5 ± 1.5}\text{ps}\text{, ρ}{}^{103}\text{Rh}$, $\text{5}\text{2}{}^{\mathrm{?}}\text{, 357}\text{keV}\text{) = 112 ± 10}\text{ps}\text{; τ(}{}^{107}\text{Ag}$, $\text{3}\text{2}{}^{\mathrm{?}}\text{, 325}\text{keV}\text{) = 7.2 ± 1.3}\text{ps}\text{, τ(}{}^{107}\text{Ag}$, $\text{5}\text{2}{}^{\mathrm{?}}\text{, 423}\text{keV}\text{) = 43 ± 3}\text{ps}\text{; τ(}{}^{109}\text{Ag}$, $\text{3}\text{2}{}^{\mathrm{?}}\text{, 311}\text{keV}\text{) = 8.5 ± 1.0}\text{ps}\text{, τ(}{}^{109}\text{Ag}$, $\text{5}\text{2}{}^{\mathrm{?}}\text{, 415}\text{keV}\text{) = 50 ± 3}\text{ps}$. Of t correction factors taken into account the perturbation of the γ-ray angular distribution by the magnetic hyperfine interaction during recoil through vacuum was found to give the largest correction to the measured lifetimes. These lifetimes lead to reduced transition probabilities B_d(E2) for the silver nuclei in reasonable agreement with the predictions of the core-excitation theory.