Variation of half-life and internal-conversion electron energy spectrum between U235m oxide and fluoride

Y. Shigekawa, Y. Kasamatsu, Y. Yasuda, M. Kaneko, M. Watanabe, and A. Shinohara
Phys. Rev. C 98, 014306 – Published 5 July 2018

Abstract

The nuclear half-life of U235m has been reported to vary depending on the chemical environment. In this study, both the half-life and the internal-conversion (IC) electron energy spectrum were measured for U235m with identical chemical environments for the first time. U235m oxide and fluoride samples were subjected to these measurements, and clear differences in the half-life and the energy spectrum between these samples were observed. The peaks in the energy spectra were identified with a relativistic density functional theory calculation. The molecular orbital states of the U235m oxide and fluoride, which were estimated from the energy spectra and the calculation, qualitatively explained the difference in the half-lives between the samples.

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  • Received 18 April 2018

DOI:https://doi.org/10.1103/PhysRevC.98.014306

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Y. Shigekawa1,*, Y. Kasamatsu1, Y. Yasuda1, M. Kaneko2, M. Watanabe2, and A. Shinohara1

  • 1Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
  • 2Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

  • *shigekaway13@chem.sci.osaka-u.ac.jp

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Vol. 98, Iss. 1 — July 2018

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