RIKEN Nishina Center for Accelerator-Based Science SLOWRI Team
Team Leader: Hironobu Ishiyama (D.Sc.)
Research Summary

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. So far, masses on more than 150 radioactive isotopes have been measured.
Main Research Fields
- Mathematical & Physical Sciences
Related Research Fields
- Interdisciplinary Science & Engineering
- Nuclear Physics
Keywords
- Nuclear Physics
- Nuclear Astrophysics
- Science with RI beam
Selected Publications
- 1.
Xian, W., Chen, S., Nikas, S., Rosenbusch, M., Wada, M., Ishiyama, H., Hou, D., Iimura, S., Nishimura, S., Schury, P., Takamine, A., Yan, S., Browne, F., Doornenbal, P., Flavigny, F., Hirayama, Y., Ito, Y., Kimura, S., Kojima, T.M., Lee, J., Liu, J., Miyatake, H., Michimasa, S., Moon, J.Y., Naimi, S., Niwase, T., Sonoda, T., Suzuki, D., Watanabe, Y.X., Werner, V., Wimmer, K., and Wollnik, H.
"Mass measurements of neutron-rich A∼90 nuclei constrain element abundances"
Phys. Rev. C 109, 035804 (2024). - 2.
Hou, D.S., Takamine, A., Rosenbusch, M., Xian, W.D., Iimura, S., Chen, S.D., Wada, M., Ishiyama, H., Schury, P., Niu, Z.M., Liang, H.Z., Yan, S.X., Doornenbal, P., Hirayama, Y., Ito, Y., Kimura, S., Kojima, T.M., Korten, W., Lee, J., Liu, J.J., Liu, Z., Michimasa, S., Miyatake, H., Moon, J.Y., Naimi, S., Nishimura, S., Niwase, T., Sonoda, T., Suzuki,D., Watanabe, Y.X., Wimmer, and Wollnik, H.
"First direct mass measurement for neutron-rich 112Mo with the new ZD-MRTOF mass spectrograph system"
Phys. Rev. C 108, 054312 (2023). - 3.
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). - 4.
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). - 5.
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). - 6.
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). - 7.
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). - 8.
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). - 9.
Wada., M
"Genealogy of gas cells for low-energy RI-beam production"
Nucl. Instrm. Meth. B 317, 450 (2013). - 10.
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).
Recent Research Results
Jun. 13, 2014
Measuring a magnetic haloSep. 6, 2013
Exotic isotopes step on the scale
Related Links
Lab Members
Principal investigator
- Hironobu Ishiyama
- Team Leader
Core members
- Takao Kojima
- Special Temporary Research Scientist
- Tetsu Sonoda
- Technical Scientist
- Takeshi Maie
- Expert Technician
Contact Information
RIBF 415
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: hironobu.ishiyama@riken.jp