The ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ activity has been obtained by chemical separation of the parent nucleus ${}_{}{}^{102}{}_{}{}^{}\mathrm{Mo}$ from an U${\mathrm{O}}_2$(N${\mathrm{O}}_3$)${}_2{}^{}{}_{}{}^{}\mathrm{·}$6 ${\mathrm{H}}_2$O sample, irradiated with 20-MeV bremsstrahlung. Four successive Ge(Li) spectra were measured. Several new $\gamma$ rays were found and the energy values and relative intensities of the known $\gamma$ lines are compared to the existing data. Levels at 0, 475.07, 943.65, 1103.15, 1580.83, and 1837.10 keV were found to be fed in the ${\beta }^{-}$ decay of ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$. Based on the well-known, spectrometrically determined, yield for mass 102 in the thermal neutron fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ the absolute intensity for the 475.0 keV $\gamma$ ray has been determined. A value of (6.25±1.0)% was found. Also the absolute intensities of the other observed $\gamma$ lines could be obtained. Intensities for all $\beta$ branches and corresponding $log\mathrm{ft}$ values were calculated. The results differ considerably from those given in the literature. The systematics of the energy spectra of the doubly even Ru isotopes in the mass region $94<A<\mathrm{}110\mathrm{}$ are discussed. The total potential energy surface for quadrupole deformation is calculated. Energy spectra for ${}_{}{}^{102}{}_{}{}^{}\mathrm{Ru}$ are calculated within the interacting boson model and also treating cubic anharmonicities in perturbation theory. They are compared with the experimental results.

RADIOACTIVITY ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n_{\mathrm{th}}, f)$ and ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}(\gamma , f)$, $E_{{\gamma }_{max}}=20\mathrm{}$ MeV, chemical separation of Mo]. Measured $E_{\gamma }$, $I_{\gamma }$. ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ deduced $log\mathrm{ft}$ ${}_{}{}^{102}{}_{}{}^{}\mathrm{Ru}$ deduced levels, $j$, $\pi$.

• Received 20 March 1977

DOI:https://doi.org/10.1103/PhysRevC.18.486