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Addressing Implicit Uncertainties and Issues in ENSDF Data Management

This document discusses several critical issues related to the ENSDF format as observed by Alejandro Sonzogni from the National Nuclear Data Center at Brookhaven National Laboratory. It highlights problems with implicit uncertainties in branching ratios and the over-determined nature of certain quantities, leading to questions about absolute gamma uncertainties. Furthermore, discrepancies in recorded data, specifically in intensity calculations for beta and EC decays, complicate conversion to numerical values. The need for a revised format that can effectively address these issues for better data management is emphasized.

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Addressing Implicit Uncertainties and Issues in ENSDF Data Management

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  1. Some ENSDF Issues Alejandro Sonzogni National Nuclear Data Center Brookhaven National Laboratory

  2. Implicit uncertainties For instance if BR = 1, we assume BR = 1 +- 0, and so on: NT=1 BR=1 NB=1 IG=100 IB=100 This leads to IG=79.74 14 %, and the uncertainty is really a lower limit.

  3. Over-determined quantities For instance, we give NR, NT, IG and TI Which value we use of absolute gamma uncertainty? 5 % or 0.14 % This problem gets ugly when we give BR, NB and BRNB For instance: BR=0.40 5, NB=2.5, BRNB=1 Also, BR and DBR is given at least twice in the file, in the adopted levels as a continuation record (multiplied by 100) and in the parent record. The disagreement between these numbers has been observed.

  4. Sum of beta and EC intensities Ideally, S IB = 100 BR This, however, happens rarely… FMTCHK doesn’t warn about the excess or missing intensity For EC/B+ decay datasets one could have I(511 keV) > 2!

  5. Conclusions Some annoying issues in ENSDF make the conversion to numerical values harder. We have outgrown the format and the software tools we use. Any future format should address these issues, as well as the atomic radiation one. Let’s discuss.

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