Theoretical treatment of the asymptotic behavior of fission product decay heat toward very short cooling-time

Tadashi Yoshida*, Takahiro Tachibana

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The asymptotic behavior of the FP decay heat has been studied toward the very short cooling-time range down to 0.1s after a fission event. For this purpose we apply the second generation of the gross theory of β-decay and estimate the decay properties of short-lived FP nuclides. In order to reproduce the recent measurements adequately, we introduce a new parameter named the Q00-factor, and optimize it in terms of the calculation of the half-lives and the average β- and γ-ray energy releases per decay (Eβ− and Eγ-values). The favorable value of the Q00-factor is 1.0 for the half-lives and about 0.4 for the Eβ− and Eγ-values. The Eβ and Eγ-values thus calculated for the short-lived nuclides, whose β-decay Q-values are larger than 3–4 MeV, guarantee a good reproduction of asymptotic behavior of the measured decay heat toward the very short cooling-time range. Adoption of the present calculation to data files for the summation calculations is recommended from a practical point of view.

Original languageEnglish
Pages (from-to)491-497
Number of pages7
JournalJournal of Nuclear Science and Technology
Issue number6
Publication statusPublished - 2000 Jun


  • Beta decay
  • Beta strength function
  • Decay heat
  • Evaluated data
  • Evaluation method
  • Fission products
  • Gross theory
  • Q-value
  • Short-lived nuclides

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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