Beta-delayed neutron measurements of neutron-rich nuclei near N = 126 at RIBF

ORAL

Abstract

The neutron-rich N ~ 126 region is important to r-process calculation around the third abundance peak and study of shell evolution across N = 126 shell closure. However, only limited information about their nuclear properties is available. Experimental measurements of nuclear properties of more exotic nuclei are essential to verify theoretical models [1,2].

We will present recent progress in the BRIKEN experiment [3] at RIBF, RIKEN Nishina Center. Particle identification was confirmed by the BigRIPS separator and the silicon dE telescope. For the first time at the ZeroDegree spectrometer, half-lives and beta-delayed neutron-emission probabilities (Pn) of N ~ 126 exotic isotopes were measured by the WAS3ABi β-counting system [4] and the BRIKEN neutron counter [5]. The analysis methods used and selected preliminary results will be discussed.

References

[1] P. Möller et al., At. Data Nucl. Data Tables, 125, 1-192 (2019).

[2] T. Suzuki et al., Astrophys. J. 859(2), 133 (2018).

[3] J. Wu et al., RIBF NP-PAC Proposal, NP1712-RIBF158 (2017).

[4] S. Nishimura, Prog. Theor. Exp. Phys., 2012(1), 03C006 (2012).

[5] A. Tolosa-Delgado et al., Nucl. Instrum. Methods. Phys. Res. A, 925-133 (2019).

*This work was supported by JSPS KAKENHI Grant Numbers JP20H05648 and JP23KJ0727. T.T.Y. was supported by FoPM, WINGS Program, the University of Tokyo; JSR Fellowship, CURIE, the University of Tokyo; Teijin Kumura Scholarship; and JASSO Honors Scholarship.

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Presenters

  • Tik Tsun Yeung

    • The University of Tokyo

Authors

  • Tik Tsun Yeung

    • The University of Tokyo

  • Shunji Nishimura

    • RIKEN Nishina Center

  • Vi H Phong

    • RIKEN
    • RIKEN Nishina Center

  • Anabel Morales

    • Instituto de Fisica Corpuscular, CSIC and Universitat de Valencia
    • Instituto de Física Corpuscular, CSIC-UV

  • Jin Wu

    • Brookhaven National Laboratory
    • Brookhaven National Lab

  • Tadaaki Isobe

    • RIKEN Nishina Center
    • RIKEN

  • Megumi Niikura

    • RIKEN Nishina Center
    • High Energy Nuclear Physics Lab, RIKEN

  • Hiroyoshi Sakurai

    • RIKEN
    • RIKEN Nishina Center

  • Tom Davinson

    • University of Edinburgh

  • Iris Dillmann

    • TRIUMF

  • Alfredo Estrade

    • Central Michigan University

  • Naoki Fukuda

    • RIKEN Nishina Center
    • RIKEN

  • Robert Grzywacz

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Oscar Hall

    • University of Edinburgh

  • Yoshikazu Hirayama

    • KEK Wako Nuclear Science Center
    • KEK
    • High Energy Accelerator Research Organization (KEK)
    • WNSC, IPNS, High Energy Accelerator Research Organization (KEK)
    • WNSC, KEK
    • Wako Nuclear Science Center (WNSC), KEK

  • Eiji Ideguchi

    • RCNP, Osaka University

  • Kei Kokubun

    • The University of Tokyo

  • Filip G Kondev

    • Argonne National Laboratory

  • Rurie Mizuno

    • The University of Tokyo
    • University of Tokyo

  • Momo Mukai

    • Nagoya University
    • Department of Physics, Nagoya University, Japan
    • RNC, RIKEN

  • Neerajan Nepal

    • Central Michigan University

  • Mohamad Nor Nurhafiza

    • Osaka University

  • Krzysztof Piotr P Rykaczewski

    • Oak Ridge National Laboratory
    • ORNL
    • Oak Ridge National Lab

  • Lewis Sexton

    • University of Edinburgh

  • Jose-Louis L Tain

    • Instituto de Fisica Corpuscular, CSIC and Universitat de Valencia
    • Instituto de Física Corpuscular, CSIC-UV
    • IFIC, CSIC-Universitat de Valencia

  • Yutaka X Watanabe

    • KEK Wako Nuclear Science Center
    • KEK
    • High Energy Accelerator Research Organization (KEK)
    • WNSC, IPNS, High Energy Accelerator Research Organization (KEK)
    • Wako Nuclear Science Center (WNSC), KEK, Japan
    • WNSC, KEK
    • Wako Nuclear Science Center (WNSC), KEK

  • Rin Yokoyama

    • CNS, The University of Tokyo
    • Center for Nuclear Study, the University of Tokyo