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Radiative Width of the Hoyle State from γ-Ray Spectroscopy

Authors :
Tamas Gabor Tornyi
Therese Renstrøm
Andreas Görgen
M. Klintefjord
B. Alshahrani
Magne Guttormsen
Gry Merete Tveten
Tibor Kibedi
Andrew Stuchbery
L. Crespo Campo
Hilde-Therese Nyhus
Ann-Cecilie Larsen
Sunniva Siem
S. Maharramova
A. I. Morales
F. L. Bello Garrote
F. Giacoppo
W. Paulsen
E. Sahin
T. K. Eriksen
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.

Details

ISSN :
10797114 and 00319007
Volume :
125
Issue :
18
Database :
OpenAIRE
Journal :
Physical review letters
Accession number :
edsair.doi.dedup.....255ffb7b25ed2f1c53ea82b106569d93