proton
Let an agent explain the proton, relay its properties, structure and discovery from physics sources, describe research topics with attribution, and distinguish the proton from the neutron, electron, hydron and positron.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain the proton, relay its properties, structure and discovery from physics sources, describe research topics with attribution, and distinguish the proton from the neutron, electron, hydron and positron.
A stable subatomic particle with a positive elementary charge and a mass of about 1.673 x 10^-27 kilograms, composed of two up quarks and one down quark bound by the strong force, found in every atomic nucleus, where the number of protons defines the chemical element; the hydrogen nucleus is a single proton, and questions such as the proton radius puzzle and whether protons decay are active research topics.
What it is for: Not applicable; a subatomic particle.
It can be explain properties and structure; relay discovery; describe research topics; distinguish related particles.
Distinguishing features
Positive charge
Three quarks
Stable
Defines atomic number
What it looks like
Not a visible object; a particle.
Physical character
mass: about 938.27 MeV/c2
charge: +1 elementary charge
charge radius: about 0.84 fm - after muonic hydrogen measurements
lifetime lower bound: over 10^34 year - no decay observed
How it is recognised
Positively charged nucleon
Proton, hydrogen nucleus, hydron
Neutrons are neutral nucleons; electrons are negative leptons; positrons are antielectrons; hydron is the general hydrogen cation
Related models
is a kind of - in registry terms
is composed of - two up and one down
is contrasted with -
was identified by - around 1917-1920
In practice
Families and kinds
free protons
protons in nuclei
antiprotons
protons in cosmic rays
proton beams in accelerators and therapy
Standards and regulation
CODATA recommended values
Failure modes and hazards
Confusing proton, hydron and hydrogen ion terms
Presenting the radius puzzle as fully unresolved or resolved without attribution
Oversimplifying quark structure
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a proton is.
Science.
Definition
Definition.
Definition
Definition.
- What is a proton, and how does it differ from the neutron, electron, positron and hydron? definition
- Is the question about properties, structure, chemistry or research? boundary
Properties
Properties.
Properties
Properties.
- What are the proton s mass, charge, spin and radius? definition
- Which entry fits the specific property? action
Physics Structure.
Science.
Quarks
Quarks and gluons.
Quarks
Quarks.
- How do quarks and gluons make up the proton and its mass? provenance
- Which references are standard? provenance
Research
Open questions.
Research
Research.
- What are the proton radius puzzle, spin crisis and proton decay searches, with findings attributed? provenance
- Which sources are cited? provenance
Applications Applications.
Application.
Chemistry
Chemistry.
Chemistry
Chemistry.
- How do protons define elements and acids? provenance
- Which entry fits atomic number? action
Therapy
Proton therapy.
Therapy
Therapy.
- How are proton beams used in cancer therapy, in general terms? provenance
- Which entry fits proton therapy? action
Context History.
Context.
History
History.
History
History.
- How did Rutherford identify the proton? provenance
- Which entry fits Ernest Rutherford? action
Cosmos
Cosmology.
Cosmos
Cosmos.
- When did protons form in the early universe? provenance
- Which entry fits Big Bang nucleosynthesis? action
What the second pass must settle
- Should proton decay be a separate entry?
- How should physics sources be linked?
- How should the proton radius puzzle be presented?