Study of $^{19}$C by One-Neutron Knockout

Abstract : The spectroscopic structure of 19C, a prominent one-neutron halo nucleus, has been studied with a 20C secondary beam at 290 MeV/nucleon and a carbon target. Neutron-unbound states populated by the one-neutron knockout reaction were investigated by means of the invariant mass method. The preliminary relative energy spectrum and parallel momentum distribution of the knockout residue, 19C*, were reconstructed from the measured four momenta of the 18C fragment, neutron, and beam. Three resonances were observed in the spectrum, which correspond to the states at Ex = 0.62(9), 1.42(10), and 2.89(10) MeV. The parallel momentum distributions for the 0.62-MeV and 2.89-MeV states suggest spin-parity assignments of 5/2+ and 1/2−, respectively. The 1.42-MeV state is in line with the reported 5/22+ state.
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Jongwon Hwang, Sunji Kim, Yoshiteru Satou, N.A. Orr, Takashi Nakamura, et al.. Study of $^{19}$C by One-Neutron Knockout. Few-Body 21 (FB21), the Twenty-first International Conference on Few-Body Problems in Physics, May 2015, Chicago, United States. pp.06014, ⟨10.1051/epjconf/201611306014⟩. ⟨in2p3-01297888⟩

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