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The neutron-rich nuclei 109 Nb and 110 Mo have been investigated by means of β-γ and isomer spectroscopy following in-flight fission of a 238 U beam at 345 MeV/nucleon at the RIBF facility. A T 1/2 = 150(30) ns isomer at 313 keV has been identified in 109 Nb. The low-lying levels in 109 Nb have been also populated following the β-decay of 109 Zr. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. For 110doi:10.1051/epjconf/20136301001 fatcat:mjbav3jkkregjdwnm4s4yoh3rm