$\beta$ decays from heavy, neutron-rich nuclei with $A\sim 190$ have been investigated following their production via the relativistic projectile fragmentation of an $E/A=1$ GeV ${}^{208}$Pb primary beam on a $\sim$2.5 g/cm${}^2$ ${}^9$Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. $\gamma$ decays were observed and correlated with these secondary ions on an event-by-event basis such that $\gamma$-ray transitions following from both internal (isomeric) and $\beta$ decays were recorded. A number of discrete, $\beta$-delayed $\gamma$-ray transitions associated with $\beta$ decays from ${}^{194}$Re to excited states in ${}^{194}$Os have been observed, including previously reported decays from the yrast $I^{\pi }=\left(6^{+}\right)$ state. Three previously unreported $\gamma$-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in ${}^{194}$Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in ${}^{194}$Os, it is concluded that there are three ${\beta }^{-}$-decaying states in ${}^{194}$Re.

• Received 18 July 2011
• Corrected 16 March 2012

DOI:https://doi.org/10.1103/PhysRevC.85.034301