| name | half-life-lifetime-conversion |
| description | Update L-record half-life value T and uncertainty DT from adopted cL T$ lifetime values by converting |t to T{-1/2} with ln(2), applying ENSDF uncertainty notation, unit scaling, and validation.
|
| argument-hint | [ENSDF file path] |
Sync cL T$ Lifetime to L-Record T/DT Fields
ENSDF 80-column data record and field definitions, structural rules, column positions, and uncertainty notation: .github/agents/ENSDF-Agent.agent.md. Spot-check policy: .github/copilot-instructions.md.
Recommended Operating Procedure
- Read the adopted lifetime from the first
|t=, |t>, or |t< in cL T$.
- Decode comment uncertainty (
{In} or {I+n-m}) in value units.
- Convert with
T{-1/2}=|t|*ln(2); scale uncertainty by ln(2).
- Choose a natural unit (
FS, PS, NS, ...): keep stored value not >100; if converted value is <0.1, scale down when the smaller unit gives <=100.
- Round value/uncertainty together so DT is valid ENSDF data-field content.
- Update one L-record at a time, then validate immediately.
Core Rule
cL T$ stores lifetime (|t), but L-record T stores half-life (T{-1/2}).
- Numeric:
T{-1/2}=|t|*ln(2).
- Symmetric uncertainty:
DT{-1/2}=D|t|*ln(2).
- Asymmetric uncertainty: Min and max are converted separately and then combined.
- Limits preserve direction:
|t>... -> T>..., |t<... -> T<....
- Follow uncertainty-in-last-digits notation. See
.github/agents/ENSDF-Agent.agent.md § ENSDF Uncertainty Notation Rules.
- Round the T value and DT uncertainty together so DT is a valid 1- or 2-digit.
- Example:
|t=649 fs {I190} → T{-1/2}=0.45 PS, DT=13.
- Choose a natural T-field unit by scaling between
FS, PS, NS, US, etc. so the stored final value is not >100 or <0.1; if the converted value is >100 or <0.1, scale up or down to the nearest appropriate unit.
- Example:
T{-1/2}=650 FS {I80} should be converted to T{-1/2}=0.65 PS {I8}.
- Example:
T{-1/2}=650 PS {I10} should be converted to T{-1/2}=0.650 NS {I10}.
- Avoid introducing unjustified or misleading extra digits.
- Do not over-truncate digits; keep physically faithful bounds.
- Example:
|t<2 fs → T{-1/2}<1.4 FS, not T{-1/2}<1 FS, which would change the original value by 40%.
Validation
- Run a reproducible random spot-check focused on transformation correctness (
|t -> T{-1/2}, decoded uncertainty -> DT).
- After each edit:
python .github/scripts/ensdf_1line_ruler.py --line "<exact 80-char line>"
- After all edits:
python .github/scripts/column_calibrate.py "file.ens"python .github/scripts/check_gamma_ordering.py "file.ens"
Audit Addendum (Recommended)
- Treat
cL, 2cL, 3cL, ... as one inseparable comment block before extracting lifetimes or averaging inputs.
- For comments containing
weighted average of or unweighted average of, verify the adopted lifetime using:
python .github/scripts/Java_Average.py --comment "<full cL T block text>"
