Hoyle state of carbon-12
E884524
The Hoyle state of carbon-12 is an excited nuclear energy level crucial for the formation of carbon in stars, enabling the synthesis of heavier elements necessary for life.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
energy level of carbon-12
ⓘ
excited nuclear state ⓘ resonance state ⓘ |
| belongsTo | spectrum of carbon-12 energy levels ⓘ |
| enablesProcess | efficient triple-alpha fusion in stars ⓘ |
| hasAtomicNumber | 6 ⓘ |
| hasConfiguration | three-alpha cluster state ⓘ |
| hasDecayMode |
decay into three alpha particles
ⓘ
gamma decay to excited states of carbon-12 ⓘ gamma decay to the ground state of carbon-12 ⓘ |
| hasEnergyAbove3AlphaThreshold | about 0.38 MeV above the triple-alpha threshold ⓘ |
| hasExcitationEnergy |
about 7.65 MeV above the ground state of carbon-12
ⓘ
approximately 7.654 MeV above the ground state of carbon-12 ⓘ |
| hasIsospin | 0 ⓘ |
| hasLifetime | about 10^-16 seconds ⓘ |
| hasMassNumber | 12 ⓘ |
| hasNucleus | carbon-12 NERFINISHED ⓘ |
| hasParity | positive parity ⓘ |
| hasQuantumNumbers | J^π = 0+ , T = 0 ⓘ |
| hasSelectionRules | E2 and E0 gamma transitions to lower states ⓘ |
| hasSpin | 0 ⓘ |
| hasSpinParity | 0+ ⓘ |
| hasStructureModel |
Bose–Einstein condensate–like alpha gas
ⓘ
alpha-cluster model ⓘ |
| hasWidth | about 8.5 eV ⓘ |
| isAbove |
first excited 2+ state of carbon-12
ⓘ
ground state of carbon-12 ⓘ |
| isCrucialFor |
formation of carbon-based life
ⓘ
stellar nucleosynthesis of carbon ⓘ |
| isImportantFor |
chemical evolution of galaxies
ⓘ
synthesis of heavier elements than helium in stars ⓘ |
| isKeyExampleOf | fine-tuning in nuclear physics ⓘ |
| isMeasuredUsing |
inelastic alpha scattering
ⓘ
inelastic electron scattering ⓘ nuclear reaction experiments such as 12C(α,α')12C* ⓘ |
| isNamedAfter | Fred Hoyle NERFINISHED ⓘ |
| isNear | three-alpha breakup threshold ⓘ |
| isPartOf | carbon-12 nucleus ⓘ |
| isPopulatedBy |
fusion of three helium-4 nuclei
ⓘ
sequential capture of alpha particles on beryllium-8 ⓘ |
| isResonanceIn | triple-alpha process ⓘ |
| isStudiedIn |
cluster models of nuclei
ⓘ
nuclear astrophysics ⓘ |
| occursIn |
helium-burning cores of massive stars
ⓘ
helium-burning red giant stars ⓘ |
| wasDiscoveredBy | nuclear spectroscopy experiments ⓘ |
| wasFirstObservedIn | 1950s ⓘ |
| wasPredictedBy | Fred Hoyle NERFINISHED ⓘ |
| wasPredictedFrom | observed cosmic abundance of carbon ⓘ |
| wasPredictedInContextOf | anthropic reasoning about carbon abundance ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.