Search for α-decay of 229mTh produced from 229Ac β-decay following 232Th(γ, p2n) reaction

H. Kikunaga, Y. Kasamatsu, K. Takamiya, T. Mitsugashira, M. Hara, T. Ohtsuki, H. Yuki, A. Shinohara, S. Shibata, N. Kinoshita, A. Yokoyama, T. Nakanishi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We produced 229Th in the nuclear reaction 232Th(γ, p2n)229Ac, followed by disintegration to 229m,gTh. The 229mTh α-decay was searched for. Alpha-particle events of energy between 4.93 MeV and 5.05 MeV were observed in the separated thorium sample of β-decay products from an actinium source highly purified from the 232Th + γ reaction products. The energies of the α-particles coincide with those expected for 229mTh.

Original languageEnglish
Pages (from-to)507-510
Number of pages4
JournalRadiochimica Acta
Issue number9-10
Publication statusPublished - 2005 Nov 17
Externally publishedYes


  • Actinium
  • Bremsstrahlung irradiation
  • Chemical treatment
  • Electron bridge mechanism
  • Nuclear isomer
  • Thorium-229

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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