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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).

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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