Radiative Width of the Hoyle State from γ-Ray Spectroscopy.

@article{Kibdi2020RadiativeWO,
  title={Radiative Width of the Hoyle State from $\gamma$-Ray Spectroscopy.},
  author={Tibor Kib{\'e}di and B. Alshahrani and Andrew E. Stuchbery and Andr{\'e} Larsen and A. G{\"o}rgen and S. Siem and M. Guttormsen and Francesca Giacoppo and A.I. Morales and Eda Şahin and G. M. Tveten and Frank Leonel Bello Garrote and Lucia Crespo Campo and T. K. Eriksen and M. Klintefjord and S. Maharramova and Hilde Therese Nyhus and T. G. Tornyi and T. Renstr{\o}m and W. Paulsen},
  journal={Physical review letters},
  year={2020},
  volume={125 18},
  pages={
          182701
        }
}
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}C, excited by the ^{12}C(p,p^{'}) reaction at 10.7 MeV proton energy. From the proton-γ-γ triple coincidence data, a value of Γ_{rad}/Γ=6.2(6)×10^{-4} was obtained for the radiative branching ratio. Using our results, together with Γ_{π}^{E0}/Γ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)PRVCAN2469-998510.1103/PhysRevC.102.024320] and the… 

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