annihilation
Let an agent explain particle annihilation and its physics, relay applications in medical imaging and colliders, distinguish the physics sense from general destruction and from the Sufi concept of fana, and route to entries for related processes.
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 particle annihilation and its physics, relay applications in medical imaging and colliders, distinguish the physics sense from general destruction and from the Sufi concept of fana, and route to entries for related processes.
In particle physics, the process in which a particle and its antiparticle collide and convert into other particles or radiation, as in electron-positron annihilation producing photons, which is used in positron emission tomography and in particle colliders; annihilation conserves energy, momentum and quantum numbers, and the word also names total destruction in general usage and, in Sufi thought, the concept of fana, the passing away of the self, which is a separate sense.
What it is for: Not applicable; a physical process with applications in imaging and research.
It can be explain the physics; relay applications; distinguish senses; route to related processes.
Distinguishing features
Matter-antimatter conversion
Conservation laws
Medical imaging use
Homonym with other senses
What it looks like
Not a visible object; detected as photons or particle showers in detectors.
Physical character
electron-positron annihilation photons: 2 photons of 511 keV - at rest
How it is recognised
Particle meets antiparticle and converts to other particles
Electron-positron annihilation as the main example
Pair production is the reverse; general destruction and Sufi fana are other senses
Related models
is a kind of - in registry terms
is a kind of - in physics
is reverse of - the inverse process
is used in - medical imaging
In practice
Families and kinds
electron-positron annihilation
proton-antiproton and other pair annihilation
annihilation in colliders
positronium decay
annihilation in astrophysics and dark matter searches
fana as a Sufi concept, a separate sense
Standards and regulation
Radiation safety rules for PET imaging
No regulation of the process itself
Failure modes and hazards
Confusing senses of annihilation
Popular misconceptions about antimatter
Radiation exposure in imaging
Also called
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.
Physics What annihilation is.
Science.
Definition
Definition and conservation.
Definition
Definition.
- What is particle annihilation, and what conservation laws govern it? definition
- Is the question about particle physics, general destruction or the Sufi concept? boundary
Examples
Examples.
Examples
Examples.
- How does electron-positron annihilation proceed, and what other annihilations occur? definition
- Which entry fits the specific process? action
Apply Applications.
Application.
PET
Medical imaging.
PET
PET.
- How does positron emission tomography use annihilation photons? provenance
- Which entry fits positron emission tomography? action
Colliders
Colliders and research.
Colliders
Colliders.
- How are annihilation reactions used in particle colliders and in dark matter searches? provenance
- Which references are standard? provenance
Theory Theory and antimatter.
Theory.
QED
Quantum electrodynamics.
QED
QED.
- How does quantum field theory describe annihilation? provenance
- Which entry fits quantum electrodynamics? action
Antimatter
Antimatter.
Antimatter
Antimatter.
- What is antimatter, and why does the universe contain so little of it, with findings attributed? provenance
- Which sources are cited? provenance
Context Other senses and history.
Context.
Senses
Other senses.
Senses
Senses.
- What is fana in Sufi thought, and how does general usage of annihilation differ from physics? provenance
- Which entry fits fana? action
History
History.
History
History.
- How was annihilation predicted by Dirac and observed after the discovery of the positron? provenance
- Which entry fits the history of particle physics? action
What the second pass must settle
- Should electron-positron annihilation be the primary entry?
- How should physics references be linked?
- The registry entry has merged an alias for the Sufi concept fana; should it be split off?