magic number
Let an agent explain magic numbers in nuclear physics and the shell model, identify magic and doubly magic nuclei, describe research on new magic numbers, and separate the computing and other senses.
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 magic numbers in nuclear physics and the shell model, identify magic and doubly magic nuclei, describe research on new magic numbers, and separate the computing and other senses.
In nuclear physics, one of the numbers of protons or neutrons, 2, 8, 20, 28, 50, 82 and 126, at which atomic nuclei are especially stable because nucleon shells are completely filled, explained by the nuclear shell model, with doubly magic nuclei such as helium-4, oxygen-16, calcium-40 and lead-208 being particularly stable; the term is also used in computing for constants embedded in code or file signatures and in chemistry for cluster sizes, senses that are noted here for disambiguation.
What it is for: Nucleon numbers giving especially stable nuclei.
It can be explain the nuclear shell model; identify magic nuclei; describe research; separate other senses.
Distinguishing features
Closed shells
Enhanced stability
Shell model explanation
Doubly magic nuclei
What it looks like
Not physical; a set of integers.
How it is recognised
Proton or neutron counts with closed shells
2, 8, 20, 28, 50, 82, 126
Magic numbers in code are embedded constants; magic constants in chemistry are cluster sizes
Related models
is a kind of - category
is related to - nuclear structure and stability
is related to - another named integer class
is related to - magic constants in code as a maintenance issue
In practice
Families and kinds
proton magic numbers
neutron magic numbers
doubly magic nuclei
new and vanishing magic numbers in exotic nuclei
magic numbers in computing and chemistry as other senses
Standards and regulation
Nuclear physics conventions
Software coding standards discouraging magic constants
No regulation
Failure modes and hazards
Confusing senses
Treating magic numbers as universal for exotic nuclei
Oversimplifying the shell model
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.magic-number
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 magic numbers are.
Physics.
Shell
Shell model.
Shell
Shell.
- How does the nuclear shell model explain magic numbers, and why do these particular numbers arise? definition
- Is the nuclear physics, computing or chemistry sense meant? boundary
Nuclei
Magic nuclei.
Nuclei
Nuclei.
- Which nuclei are magic or doubly magic, and how does this show in binding energies and abundances? provenance
- Which entry fits a specific nucleus? action
Research Research frontiers.
Science.
Exotic
Exotic nuclei.
Exotic
Exotic.
- How do magic numbers change in exotic nuclei far from stability, and what have experiments found? provenance
- Which findings are uncertain? boundary
Superheavy
Island of stability.
Superheavy
Superheavy.
- How do predicted magic numbers relate to the hypothesised island of stability for superheavy elements? provenance
- Which entry fits superheavy elements? action
Other Other senses.
Disambiguation.
Computing
Magic numbers in code.
Computing
Computing.
- What are magic numbers and file signatures in computing, and why are magic constants discouraged in code? definition
- Which entry fits software design? action
Chemistry
Magic numbers in clusters.
Chemistry
Chemistry.
- What are magic numbers in atomic clusters and other fields? definition
- Which entry fits cluster chemistry? action
Learn History and teaching.
Education.
History
History.
History
History.
- How did Goeppert Mayer, Jensen and others discover and explain magic numbers? provenance
- Which references are standard? provenance
Teach
Teaching.
Teach
Teaching.
- How can the shell model and magic numbers be taught? action
- Which misconceptions arise? provenance
What the second pass must settle
- Should the computing sense be a separate entry?
- How should nuclear data be linked?
- How should research on exotic nuclei be linked?