alpha particle relative atomic mass

The 2022 CODATA recommended value of alpha particle relative atomic mass, retained with its published standard uncertainty.

Specification version 1Published 2025-04-301 evidence records

What we know

Current frontiers derived from accepted Claims.

BEST KNOWN LOWER BOUNDPROVEN UPPER BOUND

UNKNOWN GAP

Best known lower boundGap: UnknownProven upper bound

Claims

Assertions tied to evidence, attribution, and review.

2026

CLM-CODATA-0008= 4.001 506 179 129EXACT VALUECODATA 2022 recommended value; requires Registry editorial review before publication.Evidence: 1 linked source records

SOURCE CONFIRMED

Timeline

The frontier as it changed over time.

How this frontier is derived

Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.

—No breakthrough events recorded yetEvents appear here when an accepted Claim tightens a bound or closes the frontier.

Specification

What question is being asked?

The 2022 CODATA recommended value of alpha particle relative atomic mass, retained with its published standard uncertainty.

Constraints: source=https://physics.nist.gov/cuu/Constants/Table/allascii.txt · adjustment=2022 CODATA · uncertainty=0.000 000 000 062

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Corrections & disputes

Record history

No unresolved corrections or disputes are recorded for this published version.

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Editorial status

Evidence-backed record

1 accepted Claim, with 1 linked evidence records.

Human-reviewed · No AI-only claims

Verified prizes & bounties

Active verified incentives

No active verified bounties are linked to this Limit.

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Reproducibility

Machine-checked history

No accepted machine-checked reproductions are recorded for this Limit.

Cite this LimitLimits Registry. LR-001007. alpha particle relative atomic mass. 2026.