The radiative width of the Hoyle state from $\gamma$-ray spectroscopy
| Autor: | Kibédi, T., Alshahrani, B., Stuchbery, A. E., Larsen, A. C., Görgen, A., Siem, S., Guttormsen, M., Giacoppo, F., Morales, A. I., Sahin, E., Tveten, G. M., Garrote, F. L. Bello, Campo, L. Crespo, Eriksen, T. K., Klintefjord, M., Maharramova, S., Nyhus, H. -T., Tornyi, T. G., Renstrøm, T., Paulsen, W. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.125.182701 |
| Popis: | The cascading 3.21 MeV 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$^{\prime}$) reaction at 10.7 MeV proton energy. From the proton-$\gamma$-$\gamma$ triple coincidence data, a value of ${\Gamma_{\rm rad}}/{\Gamma}=6.2(6) \times 10^{-4}$ was obtained for the radiative branching ratio. Using our results, together with ${\Gamma_{\pi}^{E0}}/{\Gamma}$ from Eriksen et al., Phys. Rev. C 102, 024320 and the currently adopted $\Gamma_{\pi}(E0)$ values, the radiative width of the Hoyle state is determined as $\Gamma_{\rm rad}=5.1(6) \times 10^{-3}$ eV. This value is about 34% higher than the currently adopted value and will impact on models of stellar evolution and nucleosynthesis. Comment: 6 pages, 6 figures |
| Databáze: | arXiv |
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