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.
|Journal||EPJ Web of Conferences|
|Publication status||Published - 2016 Mar 25|
|Event||21st International Conference on Few-Body Problems in Physics, FB 2015 - Chicago, United States|
Duration: 2015 May 18 → 2015 May 22
ASJC Scopus subject areas
- Physics and Astronomy(all)