RIKEN Nishina Center for Accelerator-Based Science Superheavy Element Research Group

Director: Hiromitsu Haba (D.Sc.)

Japanese Page

Research Summary

The heavy elements with atomic numbers exceeding 103 are called superheavy elements (SHEs). Superheavy Element Research Group, in cooperation with Superheavy Element Device Development Team and Nuclear Chemistry Group, promotes the search for new elements and research on nuclear and chemical properties of SHEs. In addition, we develop and maintain SHE production and separation devices, detectors, and chemistry apparatuses.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering
Particle/Nuclear/Astro physics
Inorganic/Coordination chemistry, Analytical chemistry
Quantum beam science

Keywords

Superheavy Element
New Element
Radioisotope
Nuclear Physics
Nuclear Chemistry

Selected Publications

1. P. Brionnet, T. Cap, M. Forge, T. Fukatsu, H. Haba, D. Kaji, S. Kimura, K. Morimoto, Y. Michimoto, T. Niwase, M. Tanaka, S. Sakaguchi, H. Sakai, and Y. Yamanouchi:
"Investigation of entrance-channel barrier distribution and charged-particle emission in the ⁵¹V + ¹⁵⁹Tb reaction"
Phys. Rev. C 110, 064601 (2024).
2. H. Sakai, H. Haba, K. Morimoto, and N. Sakamoto:
"Facility upgrade for superheavy-element research at RIKEN"
Eur. Phys. J. A 58, 238 (2022).
3. M. Tanaka, P. Brionnet, M. Du, J. Ezold, K. Felker, B. J. P. Gall, S. Go, R. K. Grzywacz, H. Haba, K. Hagino, S. Hogle, S. Ishizawa, D. Kaji, S. Kimura, T. T. King, Y. Komori, R. K. Lemon, M. G. Leonard, K. Morimoto, K. Morita, D. Nagae, N. Naito, T. Niwase, B. C. Rasco, J. B. Roberto, K. P. Rykaczewski, S. Sakaguchi, H. Sakai, Y. Shigekawa, D. W. Stracener, S. VanCleve, Y. Wang, K. Washiyama, and T. Yokokita:
"Probing optimal reaction energy for synthesis of element 119 from ⁵¹V + ²⁴⁸Cm reaction with quasielastic barrier distribution measurement"
J. Phys. Soc. Jpn. 91, 084201 (2022).
4. H. Haba, F. Fan, D. Kaji, Y. Kasamatsu, H. Kikunaga, Y. Komori, N. Kondo, H. Kudo, K. Morimoto, K. Morita, M. Murakami, K. Nishio, J. P. Omtvedt, K. Ooe, Z. Qin, D. Sato, N. Sato, T. K. Sato, Y. Shigekawa, A. Shinohara, M. Takeyama, T. Tanaka, A. Toyoshima, K. Tsukada, Y. Wakabayashi, Y. Wang, S. Wulff, S. Yamaki, S. Yano, Y. Yasuda, and T. Yokokita:
"Production of ²⁶⁶Bh in the ²⁴⁸Cm(²³Na,5n)²⁶⁶Bh reaction and its decay properties"
Phys. Rev. C 102, 024625 (2020).
5. T. Tanaka, K. Morita, K. Morimoto, D. Kaji, H. Haba, R. A. Boll, N. T. Brewer, S. Van Cleve, D. J. Dean, S. Ishizawa, Y. Ito, Y. Komori, K. Nishio, T. Niwase, B. C. Rasco, J. B. Roberto, K. P. Rykaczewski, H. Sakai, D. W. Stracener, and K. K. Hagino:
"Fusion dynamics for hot fusion reactions to synthesize superheavy nuclei revealed in quasielastic barrier distributions"
Phys. Rev. Lett. 124, 052502 (2020).
6. H. Haba:
"A new period in superheavy-element hunting"
Nat. Chem. 11, 10 (2019).
7. Y. Wang, S. Cao, J. Zhang, F. Fan, J. Yang, H. Haba, Y. Komori, T. Yokokita, K. Morimoto, D. Kaji, Y. J. Wittwer, R. Eichler, A. Türler, and Z. Qin:
"The study of rhenium pentacarbonyl complexes using single-atom chemistry in gas phase"
Phys. Chem. Chem. Phys. 21, 7147 (2019).
8. H. Haba:
"Synthesis of superheavy elements –Synthesis and discovery of the superheavy elements with atomic number Z ≥ 113–"
Radioisotopes 67, 277 (2018) (in Japanese).
9. K. Morita, K. Morimoto, D. Kaji, H. Haba, and H. Kudo:
"Discovery of new element, nihonium, and perspectives"
Prog. Nucl. Sci. Technol. 5, 8 (2018).
10. T. Tanaka, Y. Narikiyo, K. Morita, K. Fujita, D. Kaji, K. Morimoto, S. Yamaki, Y. Wakabayashi, K. Tanaka, M. Takeyama, A. Yoneda, H. Haba, Y. Komori, S. Yanou, B. J.-P. Gall, Z. Asfari, H. Faure, H. Hasebe, M. Huang, J. Kanaya, M. Murakami, A. Yoshida, T. Yamaguchi, F. Tokanai, T. Yoshida, S. Yamamoto, Y. Yamano, K. Watanabe, S. Ishizawa, M. Asai, R. Aono, S. Goto, K. Katori, and K. Hagino:
"Determination of fusion barrier distributions from quasielastic scattering cross sections towards superheavy nuclei synthesis"
J. Phys. Soc. Jpn 87, 014201 (2018).

Recent Research Results

Dec. 31, 2015
It’s official! Element 113 was discovered at RIKEN

Lab Members

Principal investigator

Hiromitsu Haba: Director

Core members

Daiya Kaji: Senior Technical Scientist

Contact Information

Nishina Building
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: haba [at] riken.jp

Organization

Superheavy Element Device Development Team: Kouji Morimoto (D.Sc.)