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In-gas-cell laser ionization spectroscopy at KISS

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Abstract

We have developed the KEK Isotope Separation System (KISS) at RIKEN to study the nuclear structure of the nuclei in the vicinity of neutron magic number \(N=\) 126 from the astrophysical perspective. These neutron-rich nuclei have been produced by using multinucleon transfer (MNT) reactions with combinations of the low-energy \(^{136}\)Xe beam and the production targets of W, Ir, and Pt. At the KISS facility, radioisotopes are ionized by applying in-gas-cell laser ionization technique. In this process, we can perform laser ionization spectroscopy of the refractory elements with the atomic number \(Z=\) 70–78 such as Hf, Ta, W, Re, Os, Ir, and Pt, which cannot be performed in other facilities. Laser spectroscopy can effectively investigate nuclear structure through the measured magnetic moments, isotope shifts (IS) \(\Delta \nu \), changes in the mean-square charge radii \(\delta <r^2>\), and quadrupole deformation parameters \(|<\beta ^2_2>|^{1/2}\). We have studied the ionization schemes of these elements through offline tests and performed in-gas-cell laser ionization spectroscopy of these refractory neutron-rich nuclei produced at KISS.

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No datasets were generated or analysed during the current study.

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Acknowledgements

This experiment was performed at the RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. The authors wish to acknowledge the staff of the accelerator for their support. This work was supported by JSPS KAKENHI Grants No. JP23244060, No. JP24740180, No. JP26247044, No. JP15H02096, No. JP17H01132, No. JP17H06090, No. JP18H03711, No. JP20H00169, No. JP21H04479, and No. JP22H00136.

Funding

This work was supported by JSPS KAKENHI Grants No. JP23244060, No. JP24740180, No. JP26247044, No. JP15H02096, No. JP17H01132, No. JP17H06090, No. JP18H03711, No. JP20H00169, No. JP21H04479, and No. JP22H00136.

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Authors and Affiliations

  1. Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan

    Yoshikazu Hirayama, Yutaka Watanabe, Peter Schury, Toshitaka Niwase, SunChan Jeong, Hiroari Miyatake, Michihiro Oyaizu, Marco Rosenbusch & Michiharu Wada

  2. RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan

    Momo Mukai, Shun Iimura, Aiko Takamine & Minori Tajima

  3. Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, 08826, Seoul, Republic of Korea

    Hyunsuk Choi

  4. Division of Experimental Facilities, Rare Isotope Science Project, Institute for Basic Science, 70, Yuseong-daero 1689-gil, Yusung-gu, 305-811, Daejeon, Republic of Korea

    Takashi Hashimoto & JunYoung Moon

  5. Department of Physics, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Chiba, Japan

    Hitoshi Nakada

  6. Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010 Asashironishi, Kumatori-cho, Sennan-Gun, 590-0494, Osaka, Japan

    Akihiro Taniguchi

Authors
  1. Yoshikazu Hirayama
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  2. Momo Mukai
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  3. Yutaka Watanabe
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  4. Peter Schury
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  5. Toshitaka Niwase
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  6. Hyunsuk Choi
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  10. Hiroari Miyatake
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  15. Aiko Takamine
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Contributions

Y.H. wrote the main manuscript text and prepared all figures. Y.H., M.M, Y.W, P.S., T.N., H.C., T.H., S.I., S.J., H.M., J.M., M.O., M.R., A.T., M.T., A.T., and M.W : data acquisition. Y.H., M.M., and H.C. : data analysis. H.N. : interpretation of data.

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Correspondence to Yoshikazu Hirayama.

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Hirayama, Y., Mukai, M., Watanabe, Y. et al. In-gas-cell laser ionization spectroscopy at KISS. Hyperfine Interact 245, 41 (2024). https://doi.org/10.1007/s10751-024-01886-1

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