Details

Autor(en) / Beteiligte

• Montagnoli, G.
• Stefanini, A.M.
• Esbensen, H.
• Corradi, L.
• Courtin, S.
• Fioretto, E.
• Grebosz, J.
• Haas, F.
• Jia, H.M.
• Jiang, C.L.
• Mazzocco, M.
• Michelagnoli, C.
• Mijatović, T.
• Montanari, D.
• Parascandolo, C.
• Scarlassara, F.
• Strano, E.
• Szilner, S.
• Torresi, D.

Titel

Oscillations above the barrier in the fusion of 28Si + 28Si

Ist Teil von

• Physics letters. B, 2015-06, Vol.746 (C), p.300-304

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (ΔElab=0.5 MeV). Regular oscillations have been observed, best evidenced in the first derivative of the energy-weighted excitation function. For the first time, quite different behaviors (the appearance of oscillations and the trend of sub-barrier cross sections) have been reproduced within the same theoretical frame, i.e., the coupled-channel model using the shallow M3Y + repulsion potential. The calculations suggest that channel couplings play an important role in the appearance of the oscillations, and that the simple relation between a peak in the derivative of the energy-weighted cross section and the height of a centrifugal barrier is lost, and so is the interpretation of the second derivative of the excitation function as a barrier distribution for this system, at energies above the Coulomb barrier.