Radiative Width of the Hoyle State from <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi></math>-Ray Spectroscopy

T. Kibédi; B. Alshahrani; A. E. Stuchbery; A. C. Larsen; A. Görgen; S. Siem; M. Guttormsen; F. Giacoppo; A. I. Morales; E. Sahin; G. M. Tveten; F. L. Bello Garrote; L. Crespo Campo; T. K. Eriksen; M. Klintefjord; S. Maharramova; H.-T. Nyhus; T. G. Tornyi; T. Renstrøm; W. Paulsen

doi:10.1103/PhysRevLett.125.182701

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

T. Kibédi ^1,*, B. Alshahrani ^1,2,†, A. E. Stuchbery ¹, A. C. Larsen ³, A. Görgen ³, S. Siem ³, M. Guttormsen ³, F. Giacoppo^3,‡, A. I. Morales ^4,§ et al.

E. Sahin³, G. M. Tveten³, F. L. Bello Garrote³, L. Crespo Campo³, T. K. Eriksen ³, M. Klintefjord³, S. Maharramova ³, H.-T. Nyhus³, T. G. Tornyi ^3,5,∥, T. Renstrøm³, and W. Paulsen³

¹Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
²Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
³Department of Physics, University of Oslo, N-0316 Oslo, Norway
⁴Dipartimento di Fisica dell’Universitá degli Studi di Milano and INFN-Milano, 20133 Milano, Italy
⁵Institute of Nuclear Research, MTA ATOMKI, Debrecen H-4026, Hungary

^*Tibor.Kibedi@anu.edu.au
^†Present address: Department of Physics, Faculty of Science, King Khalid University, Abha, Saudi Arabia.
^‡Present address: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany, and Helmholtz-Institut Mainz, Mainz, Germany.
^§Present address: IFIC, CSIC-Universitat de Valéncia, Valéncia, Spain.
^∥Present address: Institute of Nuclear Research, MTA ATOMKI, Debrecen, Hungary.

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Phys. Rev. Lett. 125, 182701 – Published 27 October, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.182701

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 ${}^{12}C$ , 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 $Γ_{rad} / Γ = 6.2 (6) \times 10^{- 4}$ was obtained for the radiative branching ratio. Using our results, together with $Γ_{π}^{E 0} / Γ$ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)] and the currently adopted $Γ_{π} (E 0)$ values, the radiative width of the Hoyle state is determined as $Γ_{rad} = 5.1 (6) \times 10^{- 3} eV$ . This value is about 34% higher than the currently adopted value and will impact models of stellar evolution and nucleosynthesis.

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

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Radiative Width of the Hoyle State from γ-Ray Spectroscopy

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