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Radiative Width of the Hoyle State from γ-Ray Spectroscopy
- Source :
- Physical review letters. 125(18)
- Publication Year :
- 2019
-
Abstract
- The cascading 3.21 and 4.44 MeV electric quadrupole transitions have been observed from the Hoyle state at 7.65 MeV excitation energy in $^{12}\mathrm{C}$, excited by the $^{12}\mathrm{C}(p,{p}^{\ensuremath{'}})$ reaction at 10.7 MeV proton energy. From the proton-$\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ triple coincidence data, a value of ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{rad}}/\mathrm{\ensuremath{\Gamma}}=6.2(6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ was obtained for the radiative branching ratio. Using our results, together with ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}}^{E0}/\mathrm{\ensuremath{\Gamma}}$ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)] and the currently adopted ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}}(E0)$ values, the radiative width of the Hoyle state is determined as ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{rad}}=5.1(6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }\mathrm{eV}$. This value is about 34% higher than the currently adopted value and will impact models of stellar evolution and nucleosynthesis.
- Subjects :
- Physics
Branching fraction
Astrophysics::High Energy Astrophysical Phenomena
General Physics and Astronomy
State (functional analysis)
01 natural sciences
13. Climate action
Nucleosynthesis
Excited state
0103 physical sciences
Quadrupole
Radiative transfer
Atomic physics
010306 general physics
Spectroscopy
Energy (signal processing)
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 125
- Issue :
- 18
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....255ffb7b25ed2f1c53ea82b106569d93