EPJ Web Conf.
Volume 113, 201621st International Conference on Few-Body Problems in Physics
|Number of page(s)||4|
|Section||Nuclear Structure and Reactions|
|Published online||25 March 2016|
Study of 19C by One-Neutron Knockout
1 Department of Physics and Astronomy, Seoul National University, 599 Gwanak, Seoul 151-742, Republic of Korea
2 LPC-ENSICAEN, IN2P3-CNRS et Université de Caen, F-14050, Caen Cedex, France
3 Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
4 Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany
5 RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
6 Department of Physics, Tohoku University, Miyagi 980-8578 , Japan
7 Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
8 Department of Physics, Kyoto University, Kyoto 606-8502, Japan
9 GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 5, France
10 ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
11 Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
12 Institut de Physique Nucléaire, Université Paris-Sud, IN2P3-CNRS, Université de Paris Sud, F-91406 Orsay, France
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Published online: 25 March 2016
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.
© Owned by the authors, published by EDP Sciences, 2016
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