Using the on-line mass separator at the Gesellschaft für Schwerionenforschung Unilac we produced ${}_{}{}^{114}{}_{}{}^{}\mathrm{Ba}$ through the ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$${(}^{58}$Ni,2n${)}^{114}$Ba reaction and measured its production cross section to be 0.${20}_{\mathrm{-}0.09}^{+0.13\mathrm{}}$ μb. The new isotope ${}_{}{}^{114}{}_{}{}^{}\mathrm{Ba}$ represents the heaviest N=Z+2 nucleus known to date. With ΔE-E telescopes we measured the total (β-decay) half-life to be ${\mathit{T}}_{\mathrm{\beta }}$=0.${43}_{\mathrm{-}0.15}^{+0.30\mathrm{}}$ s and the partial α-decay half-life to be ${\mathit{T}}_{\mathrm{\alpha }}$≥1.2×${10}^2$ s (1 MeV≤${\mathit{E}}_{\mathrm{\alpha }}$≤4 MeV) for ${}_{}{}^{114}{}_{}{}^{}\mathrm{Ba}$. With track detectors we found a half-life for spontaneous ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ emission ${\mathit{T}}_{\mathit{C}}$≥1.1×${10}^3$ s based on three carbon events.

• Received 7 February 1995

DOI:https://doi.org/10.1103/PhysRevC.52.740