Abstract
The roles of nuclear deformation and neutron transfer in sub-barrier capture process are studied within the quantum diffusion approach. The change of the deformations of colliding nuclei with neutron exchange can crucially influence the sub-barrier fusion. The sub-barrier capture reactions following the neutron pair transfer are used for the indirect study of neutron-neutron correlation in the surface region of nucleus. The strong surface enhancement of the neutron pairing in nuclei 48 Ca, 64 Ni, and 116,124,132 Sn is demonstrated. Comparing the capture cross sections calculated without the breakup effect and experimental complete fusion cross sections, the breakup was analyzed in reactions with weakly bound projectiles 6,7,9 Li and 9 Be. A trend of a systematic behavior for the complete fusion suppression as a function of the target charge and bombarding energy is not achieved.
Highlights
The nuclear deformation and neutron-transfer process have been identified as playing a major role in the magnitude of the sub-barrier capture and fusion cross sections [1, 2].There are a several experimental evidences which confirm the importance of nuclear deformation on the capture and fusion
The importance of neutron transfer with positive Q-values on nuclear fusion originates from the fact that neutrons are insensitive to the Coulomb barrier and they can start being transferred at larger separations before the projectile is captured by target-nucleus [4]
Our results show that the observed capture enhancement at sub-barrier energies for the reactions mentioned above is related to the two-neutron transfer channel
Summary
The nuclear deformation and neutron-transfer process have been identified as playing a major role in the magnitude of the sub-barrier capture and fusion cross sections [1, 2]. [9], the two-neutron transfer channel with large positive Q-value weakly influences the fusion (capture) cross section in the. He and 11 Li have been reported in Refs. In the present paper the quantum diffusion approach[17, 18] is applied to study the fusion hindrance and the roles of nuclear deformation and neutron transfer in sub-barrier capture process. The following quadrupole deformation parameters are used: β2 (154 Sm)=0.341 [25], β2 (144 Sm)=0.05, and β2 (16 O)=β2 (48 Ca)=0
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