Monoisotopic samples of exotic, neutron-rich ${}^{111}$Mo nuclei, produced in the deuteron-induced fission of ${}^{238}$U and separated using the IGISOL3 isotope separator, coupled to the JYFLTRAP Penning trap, were used to perform $\beta$- and $\gamma$-coincidence spectroscopy of ${}^{111}$Tc. New excited levels in ${}^{111}$Tc populated in ${\beta }^{-}$ decay of ${}^{111}$Mo provide the first indication for an oblate deformation in the mass $A\approx 110$ region. The wide spin range of levels populated in ${}^{111}$Tc following the decay of ${}^{111}$Mo indicates the existence of two $\beta$-decaying levels in ${}^{111}$Mo. The Q${}_{\beta }$ value of the ${}^{111}$Mo ${\beta }^{-}$ decay was determined experimentally for the first time.

• Received 29 July 2011

DOI:https://doi.org/10.1103/PhysRevC.84.044304