Naslov
Fusion of 28Si + 28Si : oscillations above the barrier and the behavior down to 1μmicrob
(Fusion of 28Si + 28Si : oscillatioμmicrob)

Autori
Stefanini, A.M. ; Montagnoli, G. ; Corradi, L. ; Courtin, S. ; Fioretto, E. ; Grebosz, J. ; Haas, F. ; Jia, H.M. ; Mazzocco, M. ; Michelagnoli, C. ; Mijatovic, Tea ; Montanari, D. ; Parascandolo, C. ; Scarlassara, F. ; Strano, E. ; Szilner, Suzana ; Torresi, D. ; Ur, C.A.

Izvornik
EPJ web of conferences (2101-6275) 66 (2014); 03082-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
fusion reaction; sub-barrier measurement

Sažetak
Fusion excitation functions of light heavy-ion systems show oscillatory structures above the Coulomb barrier, caused by resonances or due to the penetration of successive centrifugal barriers well separated in energy. In heavier systems, the amplitude of oscillations decreases and the peaks get nearer to each other. This makes the measurements very challenging. We have performed a first experiment for 28Si + 28Si, by measuring fusion cross sections in an energy range of ~15 MeV above the barrier, with a small
0.5 MeV step. Three regular oscillations are clearly observed, which are best revealed by plotting the energy-weighted derivative of the excitation function. The excitation function has been recently measured down to cross sections 1microb with larger energy steps. Coupled-channel (CC) calculations based on a shallow potential in the entrance channel are able to reproduce the oscillations. A further analysis will provide a stringent test for the calculations, in particular for the choice of the ion-ion potential, because the subbarrier excitation function has to be reproduced as well.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je prezetiran na skupu International Nuclear Physics Conference (INPC 2013).

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