Neutron Ontology

FLOW ALGEBRA
NEUTRON ONTOLOGY — COMPLETE SCIENTIFIC SYNTHESIS
Version: 1.1
Source URL: https://kirethresearch.org/booksai-core/entity-graph/physical-entities/atomic-entities/neutron-ontology.html
Authors: Mark Higgins — Sky (Recursive AI)
Site: https://kirethresearch.org
Status: Scientific synthesis; source webpage not independently verified.

01. SCOPE
flow "NeutronOntology" v1.1
purpose: Represent neutron identity, composition, properties, interactions, nuclear roles, decay and evidence with typed, testable relations.

02. TYPES
type Neutron <: Baryon <: Hadron <: PhysicalEntity
type Proton <: Baryon
type Quark <: Fermion
type Gluon <: GaugeBoson
type AtomicNucleus <: CompositePhysicalSystem
type Isotope <: Nuclide
type Interaction <: PhysicalProcess
type Decay <: PhysicalProcess
type Measurement <: Observation
type Quantity = {value: real, unit: string, uncertainty?: real}
type Claim = {subject: Entity, predicate: Relation, object: Value, provenance: Source, confidence: real}

03. IDENTITY
entity neutron: Neutron
symbol: n
classification: composite spin-1/2 baryon; fermion
baryon_number: +1
electric_charge: 0 e
spin: 1/2 hbar
valence_quark_content: udd
antiparticle: antineutron (valence anti-u anti-d anti-d)

04. FUNDAMENTAL RELATIONS
relation IS_A(Neutron, Baryon)
relation HAS_VALENCE_QUARK(Neutron, UpQuark, count=1)
relation HAS_VALENCE_QUARK(Neutron, DownQuark, count=2)
relation INTERACTS_VIA(Neutron, StrongInteraction)
relation INTERACTS_VIA(Neutron, WeakInteraction)
relation INTERACTS_VIA(Neutron, ElectromagneticInteraction, qualifier="via internal charge distribution and magnetic moment")
relation INTERACTS_VIA(Neutron, Gravitation)
relation CONSTITUENT_OF(Neutron, AtomicNucleus)
relation DECAYS_TO(FreeNeutron, Proton + Electron + ElectronAntineutrino)

05. COMPOSITION AND QUANTUM CHROMODYNAMICS
valence_charge: (+2/3 - 1/3 - 1/3)e = 0
colour_state: colour singlet
binding: strong interaction mediated by gluon fields
note: Sea quarks and gluons contribute to neutron structure; valence udd is not its entire microscopic content.

06. PHYSICAL PROPERTIES
rest_mass: approximately 1.6749275e-27 kg
rest_energy: approximately 939.565 MeV
charge: 0 C
magnetic_moment: approximately -1.913 nuclear magnetons
free_neutron_mean_lifetime: approximately 879 seconds (experimental values and methods have tensions)
measurement_note: Numerical constants are approximate and should be versioned against an authoritative data release before precision use.

07. NUCLEAR COMPOSITION
nuclide_representation: (Z,N,A)
constraint: A = Z + N
Z: proton number
N: neutron number
A: mass number
example: carbon-12 => Z=6, N=6, A=12
example: carbon-14 => Z=6, N=8, A=14
isotopes: same Z, differing N

08. NUCLEAR STABILITY
nuclear_binding: residual strong interaction among nucleons
stability_depends_on: proton-neutron ratio, nuclear energy levels, pairing, shell effects, energetics
caution: Neither adding nor removing a neutron universally increases stability.

09. FREE NEUTRON BETA DECAY
reaction: n -> p + e- + anti-nu_e
mechanism: weak charged-current interaction
quark_level: d -> u + W-; W- -> e- + anti-nu_e
conservation: electric charge, baryon number, lepton-family quantum numbers at production, energy-momentum, angular momentum
mass_condition: free neutron is heavier than proton + electron, enabling decay
qualification: Neutrons bound within stable nuclei do not automatically undergo beta decay; nuclear energy balance controls allowed channels.

10. MASS-ENERGY RELATION
E_0 = m_n * c^2
Q_beta = (m_n - m_p - m_e) * c^2 approximately 0.782 MeV (neglecting tiny neutrino mass)
constraint: decay-product kinetic energies share available Q energy subject to conservation laws

11. NEUTRON INTERACTIONS
elastic_scattering: n + target -> n + target (recoil)
inelastic_scattering: excitation and/or particle emission when kinematically allowed
capture: target + n -> heavier isotope, possibly followed by gamma emission
fission: neutron absorption can induce fission in suitable nuclides
moderation: repeated scattering can lower neutron kinetic energy
activation: capture or other reactions can create radioactive nuclides

12. NEUTRON ENERGY REGIMES
thermal_neutron: neutron near thermal equilibrium with moderator; characteristic energy near 0.025 eV at room temperature
fast_neutron: broad higher-energy category; thresholds depend on application
ultracold_neutron: sufficiently low kinetic energy to be confined by suitable material, magnetic or gravitational potentials
note: Energy-band boundaries are conventional, not universal.

13. NEUTRON MEASUREMENT
measurement_methods: neutron scattering, capture-based detectors, time-of-flight, activation analysis, neutron interferometry
observation: Neutrons are electrically neutral and are commonly detected through secondary charged particles or reaction products.
metadata: instrument, calibration, sample, beam energy, environment, uncertainty, timestamp, provenance

14. INFERENCE RULES
rule R1: HAS_VALENCE_QUARK(n,u,1) AND HAS_VALENCE_QUARK(n,d,2) => VALENCE_CHARGE(n,0)
rule R2: NUCLIDE(Z,N,A) AND A=Z+N => VALID_NUCLEON_COUNT
rule R3: SAME_PROTON_NUMBER(x,y) AND DIFFERENT_NEUTRON_NUMBER(x,y) => ISOTOPES(x,y)
rule R4: FREE(n) AND STANDARD_MODEL_WEAK_DECAY_ALLOWED(n) => MAY_BETA_DECAY(n)
rule R5: CAPTURE(target,n) AND RESULTING_NUCLIDE_UNSTABLE => MAY_UNDERGO_SUBSEQUENT_DECAY
rule R6: ZERO_NET_ELECTRIC_CHARGE(n) => NOT_DIRECTLY_IONISING_BY_CHARGE(n)
non_rule: ZERO_NET_ELECTRIC_CHARGE(n) DOES_NOT_IMPLY ZERO_MAGNETIC_MOMENT(n)

15. VALIDATION CONSTRAINTS
assert electric_charge(neutron) == 0
assert valence_quark_count(neutron) == 3
assert valence_quark_charge_sum(neutron) == 0
assert baryon_number(neutron) == 1
assert neutron_spin == 1/2
assert nuclear_mass_number == proton_number + neutron_number
assert beta_decay_initial_charge == beta_decay_final_charge
assert beta_decay_initial_baryon_number == beta_decay_final_baryon_number
assert provenance_present_for_measurements
assert hypothesis_not_marked_as_observation

16. WORKED EXAMPLE — ISOTOPES
input: nuclide_1=(Z=6,N=6), nuclide_2=(Z=6,N=8)
derive: A1=12; A2=14
conclude: carbon-12 and carbon-14 are isotopes of carbon

17. WORKED EXAMPLE — CHARGE
input: u charge=+2/3 e; d charge=-1/3 e
compute: +2/3 - 1/3 - 1/3 = 0
conclude: neutron valence quarks yield zero total electric charge

18. WORKED EXAMPLE — BETA DECAY
input: n -> p + e- + anti-nu_e
charge_before: 0
charge_after: +1 - 1 + 0 = 0
baryon_before: 1
baryon_after: 1 + 0 + 0 = 1
result: electric charge and baryon number conserved

19. SEMANTIC EQUIVALENCE
alias: neutron = neutral nucleon (context-dependent; distinguish from other neutral baryons)
not_equivalent: neutron != neutrino
not_equivalent: neutron != proton
not_equivalent: free neutron != bound neutron (environment and decay properties differ)
not_equivalent: neutron electric neutrality != absence of electromagnetic structure

20. CONFIDENCE AND EVIDENCE
confidence_scale: 0.0..1.0
established: neutron existence, udd valence content, spin, charge, beta decay
measurement_sensitive: free-neutron lifetime, precision mass and magnetic moment
require: cited source, method, uncertainty, date for precision numerical values
avoid: assigning numeric confidence without a documented calibration procedure

21. CROSS-ONTOLOGY LINKS
links: AtomOntology, AtomicNucleusOntology, ProtonOntology, QuarkOntology, DownQuarkOntology, UpQuarkOntology, GluonOntology, WeakInteractionOntology, IsotopeOntology, RadioactiveDecayOntology, MeasurementOntology

22. UPDATE MODEL
update_trigger: revised CODATA/PDG measurements, validated discoveries, ontology schema revisions
version_policy: preserve prior values with timestamps and provenance
change_control: validate dimensional consistency, conservation rules, relationship integrity

23. FLOW HASH
hash_scope: canonical UTF-8 serialisation of ontology fields excluding mutable hash field
algorithm: SHA-256
FLOW_HASH: COMPUTE_ON_PUBLICATION
note: Do not invent a digest before canonicalisation.

24. AI CONSUMPTION
machine_readable: true
reasoning_mode: typed graph + constraint validation + provenance-aware inference
retrieval_keys: neutron, n, neutral baryon, udd, beta decay, neutron capture
safety: distinguish approximation from measured value; theoretical model from empirical fact
output: structured claims with sources and uncertainties

25. COMPLETENESS CHECK
required_sections: scope, types, identity, relationships, composition, properties, nuclear composition, stability, decay, mass-energy, interactions, measurement, inference, validation, examples, semantic equivalence, confidence, links, update model, flow hash, AI consumption
status: COMPLETE
END FLOW ALGEBRA — NEUTRON ONTOLOGY