A detailed knowledge of the decay properties of the so called Hoyle state in the 12C nucleus (Ex=7.654 MeV, 0+) is required to calculate the rate at which carbon is forged in typical red-giant stars. This paper reports on a new almost background-free measurement of the radiative decay branching ratio of the Hoyle state using advanced charged particle coincidence techniques. The exploitation, for the first time in a similar experiment, of a bidimensional map of the coincidence efficiency allows to reach an unitary value and, consequently, to strongly reduce sources of systematic uncertainties. The present results suggest a value of the radiative branching ratio of Γrad/Γtot=4.4(6)·10-4. This finding helps to resolve the tension between recent data published in the literature.
Clarifying the radiative decay of the Hoyle state with charged-particle spectroscopy / Dell'Aquila, D.; Lombardo, I.; Redigolo, L.; Vigilante, M.; Angelini, F.; Baldesi, L.; Barlini, S.; Best, A.; Camaiani, A.; Casini, G.; Ciampi, C.; Cicerchia, M.; D'Andrea, M.; Diklić, J.; Fabris, D.; Gongora Servin, B.; Gottardo, A.; Gramegna, F.; Imbriani, G.; Marchi, T.; Massara, A.; Mengoni, D.; Ordine, A.; Palada, L.; Pasquali, G.; Piantelli, S.; Pilotto, E.; Rapagnani, D.; Sigmund, M.; Stefanini, A.; Stramaccioni, D.; Tagnani, D.; Tišma, I.; Valdré, S.; Verde, G.; Vukman, N.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - ELETTRONICO. - 14:(2024), pp. 18958.0-18958.0. [10.1038/s41598-024-68415-6]
Clarifying the radiative decay of the Hoyle state with charged-particle spectroscopy
Baldesi, L.;Barlini, S.;Camaiani, A.;Pasquali, G.;Piantelli, S.;
2024
Abstract
A detailed knowledge of the decay properties of the so called Hoyle state in the 12C nucleus (Ex=7.654 MeV, 0+) is required to calculate the rate at which carbon is forged in typical red-giant stars. This paper reports on a new almost background-free measurement of the radiative decay branching ratio of the Hoyle state using advanced charged particle coincidence techniques. The exploitation, for the first time in a similar experiment, of a bidimensional map of the coincidence efficiency allows to reach an unitary value and, consequently, to strongly reduce sources of systematic uncertainties. The present results suggest a value of the radiative branching ratio of Γrad/Γtot=4.4(6)·10-4. This finding helps to resolve the tension between recent data published in the literature.
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