Abstract
Excitation functions of the reaction products were measured for the reactions induced by 4,6He projectiles on 208,206Pb targets, leading to the same compound nucleus. The excitation functions for the 2n evaporation channels were obtained at energies below the sub-Coulomb barrier region. A large value of the fusion cross section was observed in the case of the reaction induced by the weakly bound 6He projectile. This reflects an unusual mechanism is present in reactions induced by weakly bound nuclei.
Highlights
The investigation of the peculiarities of nuclear reactions induced by loosely bound nuclei, including those located far from the valley of stability has attracted a lot of interest [1, 2]
At low energies around the interaction barrier, nuclear structure manifests itself in complete fusion reactions with the formation of a compound nucleus or in the transfer of a few nucleons from the projectile to the target nucleus [3,4,5]
The excitation function for the reaction 208Pb(4He,2n)210Po leading to the same compound nucleus 212Po, as the 6He-induced reaction on 206Pb, is shown in figure 2
Summary
The investigation of the peculiarities of nuclear reactions induced by loosely bound nuclei, including those located far from the valley of stability has attracted a lot of interest [1, 2]. At low energies around the interaction barrier, nuclear structure manifests itself in complete fusion reactions with the formation of a compound nucleus or in the transfer of a few nucleons from the projectile to the target nucleus [3,4,5]. It was shown that the probability of penetrating the potential barrier increases due to the extended distribution of neutron density compared with the ordinary atomic nuclei, situated close to the valley of stability. [8], may bring forth the “coupling of the collective degrees of freedom” and, the enhancement of the interaction cross section, in particular, in the sub-barrier energy region As shown in Ref. [8], may bring forth the “coupling of the collective degrees of freedom” and, the enhancement of the interaction cross section, in particular, in the sub-barrier energy region
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