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.
@article{arxiv.1301.7529,
title = {Beta-delayed neutron and gamma-ray spectroscopy of 17C utilizing spin-polarized 17B},
author = {H. Ueno and H. Miyatake and Y. Yamamoto and S. Tanimoto and T. Shimoda and N. Aoi and K. Asahi and E. Ideguchi and M. Ishihara and H. Izumi and T. Kishida and T. Kubo and S. Mitsuoka and Y. Mizoi and M. Notani and H. Ogawa and A. Ozawa and M. Sasaki and T. Shirakura and N. Takahashi and K. Yoneda},
journal= {arXiv preprint arXiv:1301.7529},
year = {2016}
}