Superheavy element nuclear chemistry at RIKEN

Hiromitsu Haba, Daiya Kaji, Yoshitaka Kasamatsu, Hidetoshi Kikunaga, Yukiko Komori, Yuki Kudou, Kouji Morimoto, Kosuke Morita, Kazuhiro Ooe, Kazutaka Ozeki, Nozomi Sato, Atsushi Shinohara, Atsushi Toyoshima, Akihiko Yokoyama, Akira Yoneda, Takashi Yoshimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A gas-jet transport system has been coupled to the RIKEN gas-filled recoil ion separator GARIS to startup superheavy element (SHE) chemistry at RIKEN. The performance of the system was appraised using an isotope of element 104, 261Rf, produced in the 248Cm(18O,5n) 261Rf reaction. Alpha-particles of 261Rf separated with GARIS and extracted to a chemistry laboratory were successfully identified with a rotating wheel apparatus for α spectrometry. The setting parameters such as the magnetic field of the separator and the gas-jet conditions were optimized. The present results suggest that the GARIS/gas-jet system is a promising approach for exploring new frontiers in SHE chemistry: (i) the background radioactivities of unwanted reaction products are strongly suppressed, (ii) the intense beam is absent in the gas-jet chamber and hence high gas-jet efficiency is achieved, and (iii) the beam-free condition also allows for investigations of new chemical systems.

Original languageEnglish
Title of host publicationNuclear Physics Trends - 7th China-Japan Joint Nuclear Physics Symposium
Number of pages7
Publication statusPublished - 2010
Externally publishedYes
Event7th Japan-China Joint Nuclear Physics Symposium - Tsukuba, Japan
Duration: 2009 Nov 92009 Nov 13

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other7th Japan-China Joint Nuclear Physics Symposium


  • Gas-filled recoil ion separator
  • Gas-jet transport system
  • Rf
  • Superheavy element chemistry

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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