Fusion of the system ${}^{12}C +{}^{24}Mg$ far below the barrier: Evidence for the hindrance effect.

Montagnoli G., Stefanini A.M., Jiang C.L., Colucci G., Goasduff A., Brugnara D., Siciliano M., Mazzocco M., Scarlassara F., Corradi L., Fioretto E., Galtarossa F., Heine M., van Patten T., Szilner S., Colovic P., Mijatovic T., Bottoni S., Jaworski G., Zanon I.

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Mercoledì 25 h 10:00 - 13:00
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We measured the fusion excitation function for ${}^{12}C +{}^{24}Mg$ down to $\sim 15 \mub,$ to investigate the fusion hindrance phenomenon. ${}^{12}C +{}^{24}Mg$ is close to lighter systems important for heavy-stars evolution. The experiment was performed at the XTU Tandem of LNL. Here we observed that the S-factor develops a maximum vs. energy, indicating the presence of hindrance. Detailed analyses within the coupled-channels model are in progress. The systematics of the hindrance threshold for medium-light systems fits the new data for ${}^{12}C +{}^{24}Mg$. The fusion cross-section at the hindrance threshold is very large ($\sigma = 1.6$ mb). This allowed to identify hindrance in a favorable condition.

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