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Theβ-decay properties of neutron-rich Cu isotopes produced in proton-induced fission of 238 U were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The data were collected using high-resolution online mass separation, reacceleration, and digital β-γ spectroscopy methods. An improved decay scheme of N = 49 78 Cu and the first observation of N = 50 79 Cu β-delayed neutron decay followed by a gamma transition are reported. Spin and parity (5 − ) are deduced for 78gs Cu. The β-delayed neutron branching ratios (P βn ) for the 77 Cu and 79 Cu precursors are analyzed with the help of nuclear structure models.

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