Structure ofSm142from the decay ofEu142

${}_{}{}^{142}{}_{}{}^{}\mathrm{Eu}$ has been observed to have two isomers with half-lives 1.22 ± 0.22 min (${}_{}{}^{142}{}_{}{}^{}\mathrm{Eu}_{}^m{}_{}{}^{}$) and 2.4 ± 0.2 sec (${}_{}{}^{142}{}_{}{}^{}\mathrm{Eu}_{}^g{}_{}{}^{}$), both of which decay by ${\beta }^{+}$ emission to states in ${}_{}{}^{142}{}_{}{}^{}\mathrm{Sm}$, resulting in 32 and 8 $\gamma$ transitions, respectively. On the basis of ${\beta }^{+}$ and $\gamma$ ray singles and coincidence as well as conversion electron measurements, a level scheme comprising 20 excited states with deduced $J^{\pi }$ assignments has been constructed. Among the levels, a $5^{-}$ and a $7^{-}$ state at 2347.9 and 2372.0 keV, respectively, have been identified as two-quasiparticle neutron states. The half-life of the 2372.0 keV level has been measured to be 170 ± 2 ns using the ${\beta }^{+}-\gamma$ delayed coincidence technique. The ${\beta }^{+}$ end-point energy measurements yielded decay energies $Q_{\mathrm{EC}}=8.0\mathrm{}\pm 0.3 \mathrm{MeV}\mathrm{and} 8.15\pm 0.10 \mathrm{MeV}$ for ${}_{}{}^{142}{}_{}{}^{}\mathrm{Eu}_{}^g{}_{}{}^{}$ and ${}_{}{}^{142}{}_{}{}^{}\mathrm{Eu}_{}^m{}_{}{}^{}$, respectively.