Spin-parity assignments and evidence for mixed-symmetry states in ${}_{}{}^{100}{}_{}{}^{}\mathrm{Ru}$

Spin and parity of some low-lying levels in ${}_{}{}^{100}{}_{}{}^{}\mathrm{Ru}$ have been assigned by measuring K-internal conversion coefficients of the deexciting transitions. The new information, combined with the available experimental data, has been analyzed in the framework of the interacting boson model (IBM-2) to clarify the structure of the $2_3^{+}$, $2_4^{+}$, and $3_1^{+}$ levels in terms of their mixed-symmetry character. © 1996 The American Physical Society.