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arXiv · 1301.7529

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

H. Ueno·H. Miyatake·Y. Yamamoto·S. Tanimoto·T. Shimoda·N. Aoi·K. Asahi·E. Ideguchi·M. Ishihara·H. Izumi·T. Kishida·T. Kubo·S. Mitsuoka·Y. Mizoi·M. Notani·H. Ogawa·A. Ozawa·M. Sasaki·T. Shirakura·N. Takahashi·K. Yoneda
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Abstract

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.

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H. Ueno, H. Miyatake, Y. Yamamoto, S. Tanimoto, T. Shimoda, N. Aoi, K. Asahi, E. Ideguchi, M. Ishihara, H. Izumi, T. Kishida, T. Kubo, S. Mitsuoka, Y. Mizoi, M. Notani, H. Ogawa, A. Ozawa, M. Sasaki, T. Shirakura, N. Takahashi, K. Yoneda. 2013-01-31. Beta-delayed neutron and gamma-ray spectroscopy of 17C utilizing spin-polarized 17B. https://doi.org/10.1103/physrevc.87.034316

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