Abstract
In order to better understand the influence of transfer in sub-barrier nuclear reactions, cross sections for the system ^58,64Ni+^124Sn have been measured down to 0.5-1 mub and compared to detailed coupledchannel calculations. In agreement with a phenomenological Q-value systematics, calculations show the importance of including the coupling to the transfer channel for these heavy systems. No clear evidence of fusion hindrance is observed, probably due to the fact that the cross sections measured in this experiment are not low enough for the appearance of that phenomenon.
Highlights
In more recent years, thanks to the capability of reaching cross sections at the nb level, the phenomenon of the fusion hindrance was discovered [4] and explained through the saturation properties of nuclear matter [5] or the damping of the coupling strength during the adiabatic fusion process [6]
As a matter of fact in heavy systems involving soft vibrational nuclei multi-phonon excitations become dominant and, as a consequence, it is more difficult to disentangle a possibile influence of transfer in the trend of the excitation function
In the first one [13], where the excitation function of 58Ni+132Sn could only be measured down to the 0.1-1 mb region due to the low intensity of the secondary 132Sn beam, it was claimed that the influence of transfer for Ni+Sn is negligible compared to lighter systems; in the other one [14] it was concluded that the fusion enhancement due to transfer couplings should be present in heavier systems as well
Summary
Thanks to the capability of reaching cross sections at the nb level, the phenomenon of the fusion hindrance was discovered [4] and explained through the saturation properties of nuclear matter [5] or the damping of the coupling strength during the adiabatic fusion process [6]. Recent measurements on Ca+Ca [5,6,7] and Ca+Zr [8] systems have showed evidence for the effect of positive Q-value transfer coupling at subbarrier energies but no unambiguous conclusion concerning heavier systems has yet been drawn.
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