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Decay Data Library In ENDF/B-VII Alejandro Sonzogni National Nuclear Data Center

Decay Data Library In ENDF/B-VII Alejandro Sonzogni National Nuclear Data Center Brookhaven National Laboratory E-mail: sonzogni@bnl.gov. Brookhaven Science Associates. Dataset contents: Energy level, isomer count (0 for GS, 1 for first isomer,…)

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Decay Data Library In ENDF/B-VII Alejandro Sonzogni National Nuclear Data Center

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  1. Decay Data Library In ENDF/B-VII Alejandro Sonzogni National Nuclear Data Center Brookhaven National Laboratory E-mail: sonzogni@bnl.gov Brookhaven Science Associates

  2. Dataset contents: Energy level, isomer count (0 for GS, 1 for first isomer,…) Branching ratios to daughter nuclide/s isomer counts Half-life, spin and parity, mass Average radiation energies Discreet radiation energies and intensities In the ENSDF to ENDF translation: Sometimes we need to add ENSDF datasets, ex 112In, EC=56% and B-=44% Sometimes we need to subtract, ex 137Cs – 137Ba, 661g belongs to 137BA IT decay Translate all strings to numbers. ENDF/B-VII.0 Decay Data Sub-library • Single file, divided in datasets • All numerical, ready to be used in complex decay networks (reactors, stars) where nuclear decay and energy release is calculated as function of time. • A single dataset per ground state / isomer including all possible decays. Total of 3838 datasets in new sub-library. Previous version had 979 datasets (ENSDF 1985) mainly by Charlie Reich. • Work started in 2004 and was finished in December 2006. • Mostly derived from ENSDF, 2005 Nuclear Wallet Cards, with additional data.

  3. ENDF/B-VII.0 Decay Data Sub-library Use of new Internal Conversion Coefficients (BRICC) Better <ECE> <Eb> from SPEBETA for 2nd forbidden non-unique transitions 44 days < T1/2 < 1x107 years T1/2, %b-n from Pfeiffer, Kratz, Moller (2002) 1 ms to 1 s Partial T1/2 information No Decay information other than Q-value TAGS (Total Absorption Gamma Spectrometer) 10 s < T1/2 < 2000 s, Qdecay> 4 MeV Incomplete Decay Scheme <Eg> and <Eb-> from integral measurement 48 materials from INEL + 2 ISOLDE/Jyvaskyla Subject of WPEC Subgroup 25

  4. ENDF/B-VII.0 Decay Data Sub-library Authorship information is carried throughout the sub-library

  5. Decay Heat Decay Heat(t)= Sli Ni(t) Ei Ei: Energy released in decay, sum over all nuclear species involved in the decay, 732 fission products for a total of 1000 including the daughters

  6. Delayed Neutrons nd(thermal)=0.0159/fission (using ENDF/B-VII.0 decay data library and JEFF-3.1 fission yields) Very close to Keepin and JEFF-3.1 time dependence ENDF/B-VII.0: nd(thermal)=0.01585/fission

  7. Delayed Neutrons

  8. Summary • New decay library as part of ENDF/B-VII.0 • Much larger coverage, many more precise values of half-life, energy and intensity. Derived from the latest ENSDF files. • Inclusion of TAGS data and better treatment of long-lived beta emitters. • Validated with Decay Heat and Delayed Neutron calculations. • Sensitivity study to obtain list of priority nuclides, feedback to experimenters.

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