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KISS gas cell system for the nuclear spectroscopy of multinucleon transfer reaction products

ORAL · Invited

Abstract

We have developed the KEK Isotope Separation System (KISS) [1,2] at RIKEN to study heavy element synthesis in the universe. KISS presently consists of an argon gas cell based laser ion source (atomic number selection) followed by isotope separation on-line (mass number selection). KISS has successfully provided pure low-energy beams of neutron-rich isotopes near N = 126 in the platinum region and near N = 152 in the uranium region produced by multi-nucleon transfer reactions [3], which were studied by their nuclear spectroscopy such as b-decay spectroscopy, mass measurements, and laser spectroscopy.

To extend the studies to more neutron-rich regions, we plan to upgrade the KISS facility to KISS-II [4] whereby we replace the present argon gas cell with a next-generation, large-volume, cryogenic helium gas catcher utilizing an advanced RF wire carpet. The RF wire carpet structure features a 4-phase RF traveling wave technique [5] which enables efficient transport of the desired radioactive ions under a strong plasma of He2+ and e— induced by ionizing interactions with the primary and secondary beams. The helium gas catcher can offer faster, more efficient, and element-independent extraction of ions. In advance of the development of the large-volume He gas catcher, we have started to test the RF wire carpet structure installed in a small-volume cryogenic helium gas catcher at KISS. We could successfully extract radioactive ions from the gas catcher and identify them by using the MRTOF-MS.

In this presentation, we will report the activities by using the argon gas cell system at KISS, and present the development of the small-volume cryogenic helium gas catcher and the upgrade plan.

[1] Y. Hirayama et al., Nucl. Instr. and Meth. B 353, 4 (2015).

[2] Y. Hirayama et al., Nucl. Instr. and Meth. B 412, 11 (2017).

[3] Y.X. Watanabe et al., Phys. Rev. Lett. 115, 172503 (2015).

[4] T. Aoki et al., https://arxiv.org/abs/2209.12649v2.

[5] K.R Lund et al., Nucl. Instru. and Meth. B 463, 378 (2020).

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Publication: Y. Hirayama et al., PRC 98 (2018) 014321<br>Y.X. Watanabe et al., PRC 101 (2020) 041305(R)<br>P. Walker et al., PRL 125 (2020) 192505<br>M. Ahmed et al., PRC 103 (2021) 054312<br>H. Watanabe et al., PLB 814 (2021) 136088<br>Y.X. Watanabe et al., PRC 104 (2021) 024330<br>M. Mukai et al, PRC 105 (2022) 034331<br>Y. Hirayama et al, PRC 96 (2017) 014307<br>H. Choi et al, PRC 102 (2020) 034309<br>M. Mukai et al, PRC 102 (2020) 054307<br>Y. Hirayama et al., PRC 106 (2022) 034326<br>T. Niwase et al., PRL 130 (2023) 132502<br>M. Mukai et al, in preparation.

Presenters

  • 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

Authors

  • 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

  • Momo Mukai

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

  • Peter Schury

    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, KEK Wako Nuclear Science Center

  • 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

  • Shun Iimura

    Department of Physics, College of Science, Rikkyo University, Rikkyo University, RNC, RIKEN, Department of Physics, Rikkyo University

  • Hironobu Ishiyama

    RIKEN Nishina Center, RIKEN Nishina Center for Accelerator-Based Science, RIKEN Nishina Center for Accelerator-Based Science, Japan, RNC, RIEKN

  • Sunchan Jeong

    WNSC, IPNS, High Energy Accelerator Research Organization (KEK), KEK, WNSC, KEK

  • Hiroari Miyatake

    High Energy Accelerator Research Organization (KEK), WNSC, IPNS, High Energy Accelerator Research Organization (KEK), KEK, WNSC, KEK

  • Marco Rosenbusch

    RIKEN Nishina Center, RIKEN Nishina Center for Accelerator-Based Science, RIKEN Nishina Center for Accelerator-Based Science, Japan, WNSC, KEK

  • Aiko Takamine

    RIKEN Nishina Center, RIKEN Nishina center, RNC, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, Japan

  • Akihiro Taniguchi

    Institute for Integrated Radiation and Nuclear Science, Kyoto University, KURNS, Kyoto University

  • Michiharu Wada

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