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