Fusion hindrance and Pauli blocking in ${}^{58}Ni + {}^{64}Ni$.

Stefanini A.M., Montagnoli G., Colucci G., Galtarossa F., Goasduff A., Grebosz J., Heine M., Jaworski G., Mijatovic T., Szilner S., Colovic P., Corradi L., Fioretto E., Del Fabbro M., Brugnara D., Zanon I., Siciliano M., Bajzek M.

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Mercoledì 25 h 10:00 - 13:00
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We measured sub-barrier fusion cross-sections for ${}^{58}Ni + {}^{64}Ni$, where the influence of positive Q-value transfer channels was evidenced in previous experiments. The lowest measured cross section for ${}^{58}Ni + {}^{64}Ni$, was relatively large ($\sim 0.1$ mb), so that no hindrance was observed. The present measurements have been performed at the XTU Tandem of LNL and the excitation function has been extended by two orders of magnitude downward. We observed a flat excitation function down to $\sim 1 \mub$ and hindrance is not observed. So the availability of several states following transfer with $Q>0$, counterbalances Pauli repulsion that reduces tunneling inside the Coulomb barrier.

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