Influence of energetics on the thresholds of heavy ion transfer reactions

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Abstract
The possibility of sub-barrier transfers is discussed from the point of view of the energetics of the reaction. The position of the entrance channel potential energy curve Vi(R) relative to that of the exit channel corrected for the mass balance Vf(R ) - Qgg appears to be crucial. When the former curve is situated above the latter one, the transfer is energetically probable and will occur as soon as the colliding nuclei are sufficiently close to each other, i.e. for sub-barrier incident energies. Experimental examples are given