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RIKEN Nishina Center for Accelerator-Based Science SLOWRI Team

Team Leader: Hironobu Ishiyama (D.Sc.)

Research Summary

Hironobu  Ishiyama(D.Sci)

SLOWRI is a universal low-energy RI-beam device at the downstream of BigRIPS at RIBF, which provides a wide variety of short-lived nuclei as high-purity and low-emittance ion beams.
SLOWRI consists of two kinds of gas catchers, He gas catcher with RF carpets for ion guide and Ar gas catcher with resonant laser ionization. In 2020, the He gas catcher and a multiple reflection time-of-flight mass spectrograph (MRTOF) were installed at BigRIPS to begin comprehensive mass measurements of unmeasured short-lived nuclei using a low-energy RI beams.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering
  • Nuclear Physics


  • Nuclear Physics
  • Nuclear Astrophysics
  • Science with RI beam

Selected Publications

  • 1. Iimura, S., Rosenbusch, M., Takamine, A., Tsunoda, Y., Wada, M., Chen, S., Hou, D.S., Xian, W., Ishiyama, H., Yan, S., Schury, P., Crawford, H, Doornenbal, P., Hirayama, Y., Ito, Y., Kimura, S., Koiwai, T., Kojima, T.M., Koura, H., Lee, J., Liu, J., Michimasa, S., Miyatake, H., Moon, J.Y., Nishimura, S., Naimi, S., Niwase, T., Odahara, A., Otsuka, T., Paschalis, S., Petri, M., Shimizu, N., Sonoda, T., Suzuki, D., Watanabe, Y.X., Wimmer, K., and Wollnik, H.
    "A new study of the N=32 and N=34 shell gap for Ti and V by the first high-precision MRTOF mass measurements at BigRIPS-SLOWRI"
    Phys. Rev. Lett. 130, 012501 (2023).
  • 2. Rosenbusch, M., Wada, M., Chen, S., Takamine, A., Iimura, S., Hou, D., Xian, W., Yan, S., Schury, P., Hirayama, Y., Ito, Y., Ishiyama, H., Kimura, S., Kojima, T., Lee, J., Liu, J., Michimasa, S., Miyatake, H., Mukai, M., Moon, J.Y., Nishimura, S., Naiumi, S., Niwase, T., Sonoda, T., Watanabe, Y.X., and Wolnik, H.
    "The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN's RIBF facility"
    Nucl. Instrum. Methods A 1047,167824 (2023).
  • 3. Schury, P., Niwase, T., Wada, M., Brionnet, P., Chen, S., Hashimoto, T., Haba, H., Hirayama, Y., Hou, D.S., Iimura, S., Ishiyama, H., Ishizawa, S., Ito, Y., Kaji, D., Kimura, S., Koura,H., Liu, J., Miyatake, H., Moon, J.Y., Morimoto, K., Morita, K., Nagae, D., Rosenbusch, M., Takamine, A., Watanabe, Y.X., Wollnik, H., Xian, W., and Yan, S.X.
    "First high-precision direct determination of the atomic mass of a superheavy nuclide"
    Phys. Rev. C 104, L021304 (2021).
  • 4. Rosenbusch, M., Wada, M., Schury, P., Ito, Y., Ishiyama, H., Ishizawa, S., Hirayama, Y., Kimura, S., Kojima, T.M., Miyatake, H., Moon, J.Y., Niwase, T., Sonoda, T., Takamine, A., Watanabe, Y.X., and Wollnik, H.
    "A new multi-reflection time-of-flight mass spectrograph for the SLOWRI facility"
    Nucl. Instrum Methods B 463, 184-188, (2020).
  • 5. Sonoda, T., Katayama, I., Wada, M., Iimura, H., Sonnenschein, V., Iimura, S., Takamine, A., Rosenbusch, M., Kojima, T.M., Ahn, D.S., Fukuca, N., Kubo, T., Nishimura, S., Shimizu, Y., Suzuki, H., Takaeda, H., Tanigaki, M., Tomita, H., Yoshida, K., and Ishiyama, H.
    "Conceptural studey on parastic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beam in the paralstic gas cell"
    Prog. Theor. Exp. Phys. Vol. 2019-11, 113D02, (2019).
  • 6. Sonoda, T., Iimura, H., Reponen, M., Wada, M., Katayama, I., Sonnenscheine, V., Takamatsu, T., Tomita, H. and Kojima, T.M.
    "The laser and optical system for the RIBF-PALIS experiment"
    Nucl. Instrum. and Methods A 877 118 (2018).
  • 7. Takamine, A., Wada, M., Okada, K., Ito, Y., Schury, P., Arai, F., Katayama, I., Imamura, K., Ichikawa, Y., Ueno, H., Wollnik, H., and Shutessler, H.A.
    "Towards high precision measurements of nuclear g-factors for the Be isotopes"
    Nucl. Instrum. Methods B 376, 307 (2016).
  • 8. Wada., M
    "Genealogy of gas cells for low-energy RI-beam production"
    Nucl. Instrm. Meth. B 317, 450 (2013).
  • 9. Takamine, A., Wada, M., Okada, K., Nakamura, T., Schury, P., Sonoda, T., Lioubimov, V., Iimura, H., Yamazaki, Y., Kanai, Y., Kojima, T.M., Yoshida, A., Kubo, T., Katayama, I., Ohtani, S., Wollnik, H., and Schuessler, H.A.:
    "Isotope shift measurements of 11,9,7Be+"
    Eur. Phys. J. A. 10883-5 (2009).
  • 10. Takamine, A., Wada, M., Ishida, Y., Nakamura, T., Okada, K., Yamazaki, Y., Kambara, T., Kanai, Y., Kojima, T.M., Nakai, Y., Oshima, N., Yoshida, A., Kubo, T., Ohtani, S., Noda, K., Katayama, I., Hostain, P., Varentsov, V., and Wollnik, H.:
    "Space-charge effect in the catcher gas cell of a rf ion guide"
    Rev. Sci. Instrum. 76, 103503 (2005).

Recent Research Results

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Lab Members

Principal investigator

Hironobu Ishiyama
Team Leader

Core members

Takao Kojima
Senior Research Scientist
Aiko Takamine
Research Scientist
Tetsu Sonoda
Technical Scientist
Takeshi Maie
Expert Technician
Marco Rosenbusch
Special Postdoctoral Researcher

Contact Information

RIBF 415
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: hironobu.ishiyama [at] riken.jp