Nuclear structure studies of 254Es region by Coulomb excitation gamma-ray spectroscopy

ORAL

Abstract

What is the limit of high Z nucleus, where is the island of stability, is one of the focus of nuclear
physics. Key ingredient to stabilize nucleus in this super-heavy region is shell structure and Z=114,120, N=184 are predicted to be new magic numbers. However, it is not easy to produce such nucleus and study the shell structure.

In order to access such shell structure, we are focusing on the deformed nucleus of the heavy mass region including Es isotopes. By studying the excited states, spin and parity, and deformation, we will be able to access the single-particle orbital which is supposed to generate new shell structure at Z=114, 120, N=184 and try to investigate nuclear shell structure in the super-heavy mass region.

Coulomb excitation experiment at the Tokai Tandem Accelerator Laboratory of JAEA is planned to measure B(E2) values of low-lying states in 254Es and to deduce the deformation. Unknown high-lying states of 254Es will be also investigated for further understanding of nuclear structure in this region. We obtained 254Es via an international collaboration with ORNL. CAGRA will be used to measure the gamma rays from 254Es. 

Experimental plan and preparation progress will be presented.

*This work is supported by JSPS KAKENHI Grant Number JP 17H02893.

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Presenters

  • Rikuto Yanagihara

    • ANL, IMP, TIFR, LBNL, KTH, INFN-LNL Legnaro
    • Osaka Univ.
    • RCNP, Osaka University

Authors

  • Rikuto Yanagihara

    • ANL, IMP, TIFR, LBNL, KTH, INFN-LNL Legnaro
    • Osaka Univ.
    • RCNP, Osaka University

  • Eiji Ideguchi

    • RCNP, Osaka Univ.
    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University

  • Katsuhisa Nishio

    • Japan Atomic Energy Agency

  • Riccardo Orlandi

    • Japan Atomic Energy Agency
    • JAEA

  • Hiroyuki Makii

    • Japan Atomic Energy Agency

  • Masato Asai

    • Japan Atomic Energy Agency

  • Kentaro Hirose

    • Japan Atomic Energy Agency

  • Kazuaki Tsukada

    • Japan Atomic Energy Agency

  • Atsushi Toyoshima

    • Japan Atomic Energy Agency

  • Tetsuya K. Sato

    • Japan Atomic Energy Agency

  • Pham Thanh Tung

    • RCNP, Osaka Univ.

  • Nori Aoi

    • RCNP, Osaka Univ.
    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University
    • RCNP Osaka University
    • RCNP, Osaka Uni., Japan

  • Kumar Raju Mukhi

    • RCNP, Osaka Univ.

  • Yasutaka Yamamoto

    • RCNP, Osaka Univ.
    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University

  • Thi Ha Hoang

    • RCNP, Osaka Univ.
    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University

  • Asahi Kohda

    • RCNP, Osaka Univ.
    • RCNP, Osaka Uni., Japan

  • Shigeru Kubono

    • RIKEN Nishina Center
    • RIKEN

  • Shin'ichiro Michimasa

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, University of Tokyo
    • CNS, Univ. of Tokyo
    • CNS, University of Tokyo

  • Takeshi Koike

    • Tohoku University
    • Tohoku Univ.

  • Naohito Iwasa

    • Tohoku Univ.

  • Michael P P Carpenter

    • Argonne Natl Lab
    • Argonne National Laboratory
    • ANL

  • Krzysztof P. Rykaczewski

    • ORNL Physics Division
    • ORNL
    • Oak Ridge National Laboratory

  • Fang Yong-De

    • IMP

  • Partha Chowdhury

    • Univ of Mass - Lowell
    • Univ. of Mass - Lowell

  • Rikuto Yanagihara

    • ANL, IMP, TIFR, LBNL, KTH, INFN-LNL Legnaro
    • Osaka Univ.
    • RCNP, Osaka University