@article{9917b6df12a64b13b196ab2e5d08c505,
title = "Estimation of radiative half-life of Th 229m by half-life measurement of other nuclear excited states in Th 229",
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. ",
author = "Y. Shigekawa and A. Yamaguchi and K. Suzuki and H. Haba and T. Hiraki and H. Kikunaga and T. Masuda and S. Nishimura and N. Sasao and A. Yoshimi and K. Yoshimura",
note = "Funding Information: We are grateful to K. Yoshida and H. Watanabe for fruitful theoretical discussions. A.Y. acknowledges funding from the Technology Pioneering Projects by RIKEN. This paper was supported by a JSPS Grant-in-Aid for Scientific Research (B) Grants No. JP18H01241, No. JP15H03661, and No. JP18H01230. The sample used in this paper was provided by the cooperation project between the Japan Atomic Energy Agency and the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposals No. 17K0204, No. 17F0011, and No. 18F0014). Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = aug,
doi = "10.1103/PhysRevC.104.024306",
language = "English",
volume = "104",
journal = "Physical Review C",
issn = "2469-9985",
publisher = "American Physical Society",
number = "2",
}