Limits RegistryPUBLIC RECORD
Limits RegistryThe 2022 CODATA recommended value of neutron-proton mass difference in u, retained with its published standard uncertainty.
The question, scope, and sources behind this Registry record.
The 2022 CODATA recommended value of neutron-proton mass difference in u, retained with its published standard uncertainty.
Record the 2022 CODATA recommended value of neutron-proton mass difference in u in u.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
Current frontiers derived from accepted Claims.
A published value under the current specification, not two opposing bounds.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
Permanent ID limitsregistry.com/limits/LR-001247
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Limits Registry. LR-001247. neutron-proton mass difference in u. 2026.