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The ground-state properties of neutron-rich 106Nb and its beta decay into106Mo have been studied using the CARIBU radioactive-ion-beam facility atArgonne National Laboratory. Niobium-106 ions were extracted from a 252Cffission source and mass separated before being delivered as low-energy beams tothe Canadian Penning Trap, as well as the X-Array and SATURNbeta-decay-spectroscopy station. The measured 106Nb ground-state mass excess of-66202.0(13) keV is consistent with a recent measurement but has three timesbetter precision; this work also rules out the existence of a secondlong-lived, beta-decaying state in 106Nb above 5 keV in excitation energy. Thedecay half-life of 106Nb was measured to be 1.097(21) s, which is 8% longerthan the adopted value. The level scheme of the decay progeny, 106Mo, has beenexpanded up to approximately 4 MeV. The distribution of decay strength andconsiderable population of excited states in 106Mo of J >= 3 emphasises theneed to revise the adopted Jpi = 1- ground-state spin-parity assignment of106Nb; it is more likely to be J => 3.

Ground-state and decay properties of neutron-rich 106Nb