### Abstract

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 Q_{00}-factor, and optimize it in terms of the calculation of the half-lives and the average β- and γ-ray energy releases per decay (E_{β−} and E_{γ}-values). The favorable value of the Q_{00}-factor is 1.0 for the half-lives and about 0.4 for the E_{β−} and E_{γ}-values. The E_{β} and E_{γ}-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 language | English |
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Pages (from-to) | 491-497 |

Number of pages | 7 |

Journal | Journal of Nuclear Science and Technology |

Volume | 37 |

Issue number | 6 |

DOIs | |

Publication status | Published - 2000 Jun |

### Keywords

- 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