Estimation of radiative half-life of Th 229m by half-life measurement of other nuclear excited states in Th 229

Y. Shigekawa, A. Yamaguchi, K. Suzuki, H. Haba, T. Hiraki, H. Kikunaga, T. Masuda, S. Nishimura, N. Sasao, A. Yoshimi, K. Yoshimura

Research output: Contribution to journalArticlepeer-review

Abstract

We perform coincidence measurements between α particles and γ rays from a U233 source to determine the half-lives of the excited state in a Th229 nucleus. We first prove that the half-lives of 42.43- and 164.53-keV states are consistent with literature values, whereas that of the 97.14-keV state [93(7) ps] deviates from a previously measured value [147(12) ps]. The half-lives of 71.83- and 163.25-keV states are determined for the first time. Based on the obtained half-lives and the Alaga rule, we estimate the radiative half-life of the low-energy isomeric state (Th229m) to be 5.0(11)×103 s, which is one of the key parameters for the frequency standard based on Th229.

Original languageEnglish
Article number024306
JournalPhysical Review C
Volume104
Issue number2
DOIs
Publication statusPublished - Aug 2021

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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