Electromagnetic properties of the first 21+excited states in100,102,104Ru

Abstract

Measurements of Coulomb excitation probabilities of the first ${2}_{1}^{+}$ state of ${}^{100,102,104}$Ru were carried out using back-scattered ions of ${}^{4}$He and ${}^{16}$O. The static quadrupole moments ${Q}_{{2}_{1}^{+}}$ and the reduced transition probabilities ${B(E2;0}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ have been determined using the reorientation effect. The quadrupole moments ${Q}_{{2}_{1}^{+}}$ deduced for the positive sign of the ${2}_{2}^{+}$ interference term are $\ensuremath{-}0.54\ifmmode\pm\else\textpm\fi{}0.07$ $e\mathrm{b}$, $\ensuremath{-}0.64\ifmmode\pm\else\textpm\fi{}0.05$ $e\mathrm{b}$, $\ensuremath{-}0.62\ifmmode\pm\else\textpm\fi{}0.08$ $e\mathrm{b}$ for ${}^{100}$Ru, ${}^{102}$Ru, and ${}^{104}$Ru, respectively. The reduced transition probabilities ${B(E2;0}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ are $0.493\ifmmode\pm\else\textpm\fi{}0.003$ ${e}^{2}{\mathrm{b}}^{2}$, $0.614\ifmmode\pm\else\textpm\fi{}0.004$ ${e}^{2}{\mathrm{b}}^{2}$, and $0.809\ifmmode\pm\else\textpm\fi{}0.006$ ${e}^{2}{\mathrm{b}}^{2}$, respectively. A compilation of the available experimental results for the reduced eletric quadrupole transition probability ${B(E2;0}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ and for the static quadrupole moments ${Q}_{{2}_{1}^{+}}$ for the even ruthenium stable isotopes $(96<~A<~104)$ are presented.