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Excited states in 17C were investigated through the measurement ofbeta?-delayed neutrons and gamma rays emitted in the ? decay of 17B. In themeasurement, three negative-parity states and two inconclusive states, wereidentified in 17C above the neutron threshold energy, and seven gamma-lineswere identified in a beta?-delayed multiple neutron emission of the 17B ?decay. From these transitions, the beta?-decay scheme of 17B was determined. Inthe present work, the fibeta-NMR technique is combined with the ?-delayedparticle measurements using a fragmentation-induced spin-polarized 17B beam.This new scheme allows us to determine the spin parity of beta?-decay feedingexcited states based on the difference in the discrete fibeta-decay asymmetryparameters, provided the states are connected through the Gamow-Tellertransition. In this work, 1/2-, 3/2-, and (5/2-) are assigned to the observedstates at Ex = 2.71(2), 3.93(2), and 4.05(2) MeV in 17C, respectively.

Beta-delayed neutron and gamma-ray spectroscopy of 17C utilizing spin-polarized 17B