engleski

Fusion of the positive Q-value system S-36+Ca-48 well below the Coulomb barrier

The fusion excitation function of S-36+Ca-48 has been measured from well above the barrier down to very small cross sections at sub-barrier energies. A steady decrease of the fusion cross sections is observed below the barrier with no pronounced change of slope. The logarithmic derivative saturates and does not reach the value expected for a constant astrophysical S-factor. The S-factor does not show any maximum in the measured energy range. Coupled-channels calculations using a Woods-Saxon potential have been performed.

heavy-ion fusion ; extreme subbarrier energies ; hindrance

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