1. Alpha structure of 16O at high excitation energies by 3He+13C nuclear reactions.
- Author
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Redigolo, Luigi, Lombardo, Ivano, Dell'Aquila, Daniele, Vigilante, Mariano, Ayketin, Mualla, Baldesi, Lucia, Barlini, Sandro, Camaiani, Alberto, Casini, Giovanni, Ciampi, Caterina, Fabris, Daniela, Cicerchia, Magda, Frosin, Catalin, Gramegna, Fabiana, Marchi, Tommaso, Ordine, Antonio, Ottanelli, Pietro, Pasquali, Gabriele, Piantelli, Silvia, and Russo, Marco
- Subjects
EXCITATION (Physiology) ,NUCLEAR reactions ,RESONANCE ,ANGULAR distribution (Nuclear physics) ,CELL nuclei - Abstract
This work investigates high energy states in the self-conjugate
16 O nucleus, through the analysis of13 C(3 He,α)12 C reactions in the 1.4 2.2 MeV bombarding energy range. The cross-section of the decay channel in which an α particle is emitted in coincidence with a12 C residual nucleus in the Hoyle state, leading to four α particles in the final channel, has been measured thanks to a low-threshold and high-resolution array. The occurrence of two low-spin resonant states is highlighted by the analysis of angular distributions, with Jπ = 2+ and 3− , at respective energies of ≃ 24.1 and 24.5 MeV. In this energy window, the observed branching ratios for the transition involving the emission of the Hoyle state appear to be way larger than calculations based on the barrier penetration alone, pointing out to the possible occurrence of largely clustered high-energy states in16 O. [ABSTRACT FROM AUTHOR]- Published
- 2024
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