Half-life estimation of the first excited state of Th229 by using α-particle spectrometry

H. Kikunaga, Y. Kasamatsu, H. Haba, T. Mitsugashira, M. Hara, K. Takamiya, T. Ohtsuki, A. Yokoyama, T. Nakanishi, A. Shinohara

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

To search for a direct-decay signal from the isomer Th229m, α-particle spectra of Th229m,g produced from 93 mg of U233 have been measured by using a rapid and high-resolution α-particle spectrometry, which can distinguish α lines of Th229m from those of its ground state. Although α events were not obtained in the expected energy region for Th229m with the exception of those derived from Th229g, we can estimate that the half-life of Th229m is shorter than 2 h at 3σ confidence level under the chemical condition of chloride or hydroxide.

Original languageEnglish
Article number034315
JournalPhysical Review C - Nuclear Physics
Volume80
Issue number3
DOIs
Publication statusPublished - 2009 Sep 21
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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