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Title: Half-life estimation of the first excited state of {sup 229}Th by using {alpha}-particle spectrometry

Abstract

To search for a direct-decay signal from the isomer {sup 229}Th{sup m}, {alpha}-particle spectra of {sup 229}Th{sup m,g} produced from 93 mg of {sup 233}U have been measured by using a rapid and high-resolution {alpha}-particle spectrometry, which can distinguish {alpha} lines of {sup 229}Th{sup m} from those of its ground state. Although {alpha} events were not obtained in the expected energy region for {sup 229}Th{sup m} with the exception of those derived from {sup 229}Th{sup g}, we can estimate that the half-life of {sup 229}Th{sup m} is shorter than 2 h at 3{sigma} confidence level under the chemical condition of chloride or hydroxide.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7]; ;  [8];  [1]
  1. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
  2. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
  3. Nishina Center for Accelerator-Base Science, RIKEN, Wako, Saitama 351-0198 (Japan)
  4. Institute for Material Research, Tohoku University, Sendai, Miyagi 980-8577 (Japan)
  5. International Research Center for Nuclear Materials Science, Tohoku University, Oarai-machi, Ibaraki 311-1313 (Japan)
  6. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494 (Japan)
  7. Laboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826 (Japan)
  8. Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192 (Japan)
Publication Date:
OSTI Identifier:
21293826
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.80.034315; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; ALPHA SPECTROSCOPY; CHLORIDES; EXCEPTIONS; EXCITED STATES; GROUND STATES; HALF-LIFE; ISOMERS; RESOLUTION; SPECTRA; SPECTROSCOPY; THORIUM 229; URANIUM 233

Citation Formats

Kikunaga, H, Nishina Center for Accelerator-Base Science, RIKEN, Wako, Saitama 351-0198, Kasamatsu, Y, Haba, H, Mitsugashira, T, Hara, M, Takamiya, K, Ohtsuki, T, Yokoyama, A, Nakanishi, T, and Shinohara, A. Half-life estimation of the first excited state of {sup 229}Th by using {alpha}-particle spectrometry. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.80.034315.
Kikunaga, H, Nishina Center for Accelerator-Base Science, RIKEN, Wako, Saitama 351-0198, Kasamatsu, Y, Haba, H, Mitsugashira, T, Hara, M, Takamiya, K, Ohtsuki, T, Yokoyama, A, Nakanishi, T, & Shinohara, A. Half-life estimation of the first excited state of {sup 229}Th by using {alpha}-particle spectrometry. United States. https://doi.org/10.1103/PHYSREVC.80.034315
Kikunaga, H, Nishina Center for Accelerator-Base Science, RIKEN, Wako, Saitama 351-0198, Kasamatsu, Y, Haba, H, Mitsugashira, T, Hara, M, Takamiya, K, Ohtsuki, T, Yokoyama, A, Nakanishi, T, and Shinohara, A. 2009. "Half-life estimation of the first excited state of {sup 229}Th by using {alpha}-particle spectrometry". United States. https://doi.org/10.1103/PHYSREVC.80.034315.
@article{osti_21293826,
title = {Half-life estimation of the first excited state of {sup 229}Th by using {alpha}-particle spectrometry},
author = {Kikunaga, H and Nishina Center for Accelerator-Base Science, RIKEN, Wako, Saitama 351-0198 and Kasamatsu, Y and Haba, H and Mitsugashira, T and Hara, M and Takamiya, K and Ohtsuki, T and Yokoyama, A and Nakanishi, T and Shinohara, A},
abstractNote = {To search for a direct-decay signal from the isomer {sup 229}Th{sup m}, {alpha}-particle spectra of {sup 229}Th{sup m,g} produced from 93 mg of {sup 233}U have been measured by using a rapid and high-resolution {alpha}-particle spectrometry, which can distinguish {alpha} lines of {sup 229}Th{sup m} from those of its ground state. Although {alpha} events were not obtained in the expected energy region for {sup 229}Th{sup m} with the exception of those derived from {sup 229}Th{sup g}, we can estimate that the half-life of {sup 229}Th{sup m} is shorter than 2 h at 3{sigma} confidence level under the chemical condition of chloride or hydroxide.},
doi = {10.1103/PHYSREVC.80.034315},
url = {https://www.osti.gov/biblio/21293826}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 80,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2009},
month = {Tue Sep 15 00:00:00 EDT 2009}
}