Coulomb breakup reaction of 31Ne and its halo structure

ORAL

Abstract

It is well known that N=20 shell gap disappears in the "island of inversion." The one-neutron halo nucleus 31Ne, located in the island of inversion, has attracted much attention because it is the first example of a deformation-driven halo nucleus.
Recent experimental studies on 31Ne revealed that it has low separation energy Sn=0.15(+0.16)(-0.10) MeV, spectroscopic factor C2S=0.32(+0.21)(-0.17), and ground-state spin and parity 3/2-. This results show that 31Ne is significant p-wave halo component.
We have carried out the exclusive Coulomb breakup measurement of 31Ne for the first time using the invariant mass method. The new data enables us to determine the neutron separation energy and spectroscopic factor more precisely than the values determined by the inclusive Coulomb breakup measurement.

Coulomb breakup measurement using 31Ne beam at 230 MeV/u with a lead target was performed using SAMURAI spectrometer at RIBF, RIKEN.

In this presentation, the experimental results will be discussed.


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Presenters

  • Takato Tomai

    Tokyo Institute of Technology

Authors

  • Takato Tomai

    Tokyo Institute of Technology

  • Takashi Nakamura

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

  • Yasuhiro Togano

    Rikkyo University

  • Yosuke Kondo

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

  • Nobuyuki Kobayashi

    RCNP, Osaka Univ., RCNP, RCNP (Osaka University), RCNP, Osaka University, RCNP, Osaka Universiry, Research Center for Nuclear Physics, Osaka University

  • Hiroki Yamada

    Tokyo Institute of Technology

  • Masahiro Yasuda

    Tokyo Institute of Technology

  • Mayuko Matsumoto

    Tokyo Institute of Technology

  • Tetsuro Shimada

    Tokyo Institute of Technology