The properties of the Hoyle state in 12C (7.654 MeV, 0+) affect the rate at which carbon, one of the most abundant elements in the Universe, is forged in stars. Recent experiments reported values of its radiative decay branching ratio that are in tension, posing major implications especially in the astrophysical domain. This work reports on an almost background-free measurement of the radiative decay branching ratio of the Hoyle state that exploits charged particle coincidence techniques. The experiment adopts several methodologies to minimize the background and identify the rare signal associated with the radiative decay. Large care is devoted to having under full control two of the major sources of systematic errors in particle-coincidence experiments: the coincidence efficiency and the spurious coincidence rate. We find a radiative decay branching ratio of Γrad/Γtot = 4.2(6) · 10-4. The new finding helps to resolve the tension between recent data published in the literature.

Radiative Decay Branching Ratio of the Hoyle State in 12C via Charged Particle Coincidence Techniques / 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: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - ELETTRONICO. - 311:(2024), pp. 0-0. (Intervento presentato al convegno 5th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2024 tenutosi a hrv nel 2024) [10.1051/epjconf/202431100010].

Radiative Decay Branching Ratio of the Hoyle State in 12C via Charged Particle Coincidence Techniques

Dell'Aquila, D.;Lombardo, I.;Baldesi, L.;Barlini, S.;Camaiani, A.;Ciampi, C.;Pasquali, G.;Piantelli, S.;
2024

Abstract

The properties of the Hoyle state in 12C (7.654 MeV, 0+) affect the rate at which carbon, one of the most abundant elements in the Universe, is forged in stars. Recent experiments reported values of its radiative decay branching ratio that are in tension, posing major implications especially in the astrophysical domain. This work reports on an almost background-free measurement of the radiative decay branching ratio of the Hoyle state that exploits charged particle coincidence techniques. The experiment adopts several methodologies to minimize the background and identify the rare signal associated with the radiative decay. Large care is devoted to having under full control two of the major sources of systematic errors in particle-coincidence experiments: the coincidence efficiency and the spurious coincidence rate. We find a radiative decay branching ratio of Γrad/Γtot = 4.2(6) · 10-4. The new finding helps to resolve the tension between recent data published in the literature.
2024
EPJ Web of Conferences
5th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2024
hrv
2024
Dell'Aquila, D.; Lombardo, I.; Redigolo, L.; Vigilante, M.; Angelini, F.; Baldesi, L.; Barlini, S.; Best, A.; Camaiani, A.; Casini, G.; Ciampi, C.; Ci...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1408596
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