Study of <sup>19</sup>C using single-nucleon knockout

ORAL

Abstract

For decades, the p-sd-shell nuclei have been a useful tool to study shell evolution toward the dripline. The spectroscopic study of 19C, a one-neutron halo near the neutron dripline, is an important testing ground for the recent shell-model interactions in the p-sd shell space, especially for neutron-rich nuclei.

The unbound states of 19C were studied using single-nucleon knockout at RIBF, RIKEN. 19C was produced from 20C (20N) beam by one neutron (proton) knockout. The relative energy spectra and parallel momentum distributions were reconstructed by detecting all decay products, 18C and a neutron, using the SAMURAI spectrometer and NEBULA neutron array.

As a result, 5/2+1 was confirmed to locate just above S1n and 1/2-1 was also discovered in the neutron-knockout channel. Additional high-lying resonance over S3n was observed in the proton-knockout channel, which might involve a proton-excited 18C core. In this talk, the details of observed states and the discussion in the context of shell-model calculations will be reported.

*This work was in part supported by the WCU (R32-2008-000-10155-0) and the GPF (NRF-2011-0006492) programs of NRF Korea, JSPS KAKENHI Grant Number 16H02179 and MEXT KAKENHI Grant Number 24105005 in Japan, and the French ANR grant EXPAND (ANR-14-CE33-0022-01).

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Presenters

  • Jongwon W Hwang

    • CNS, Tokyo Univ.
    • RIKEN Nishina Center
    • Department of Physics and Astronomy, Seoul National University

Authors

  • Jongwon W Hwang

    • CNS, Tokyo Univ.
    • RIKEN Nishina Center
    • Department of Physics and Astronomy, Seoul National University

  • Sunji Kim

    • Department of Physics and Astronomy, Seoul National University

  • Yoshiteru Satou

    • Seoul National University
    • Department of Physics and Astronomy, Seoul National University

  • Nigel A Orr

    • LPC Caen
    • LPC-Caen, IN2P3/CNRS, ENSICAEN, UNICAEN et Normandie Université

  • Takashi Nakamura

    • Tokyo Institute of Technology
    • Department of Physics, Tokyo Institute of Technology
    • Tokyo Inst of Tech - Tokyo

  • Yosuke Kondo

    • Tokyo Institute of Technology
    • Department of Physics, Tokyo Institute of Technology

  • Jongwon W Hwang

    • CNS, Tokyo Univ.
    • RIKEN Nishina Center
    • Department of Physics and Astronomy, Seoul National University