Sub-barrier enhancement of fusion as compared to a microscopic method in 18O+12C

Abstract

Measurement of the energy dependence of the fusion cross-sec on at sub-barrier energies provides an important test for theoretical models of fusion. To extend the measurement of fusion cross-sections in the sub-barrier domain for the 18O+12C system. Use the new experimental data to confront microscopic calculations of fusion. Evaporation residues produced in fusion of 18O ions with 12C target nuclei were detected with good geometric efficiency and identified by measuring their energy and time-of-flight. Theoretical calculations with a density constrained time dependent Hartree-Fock (DC-TDHF) theory include for the first time the effect of pairing on the fusion cross-section. Comparison of the measured fusion excitation function with the predictions of the DC-TDHF calculations reveal that the experimental data exhibits a smaller decrease in cross-section with decreasing energy than is theoretically predicted. The larger cross-sections observed at the lowest energies measured indicate a larger tunneling probability for the fusion process. This larger probability can be associated with a smaller, narrower fusion barrier than presently included in the theoretical calculations.

4 pages, 3 figures

References in corpus (9)

• Energy dependence of nucleus-nucleus potential close to the Coulomb barrier
• 3-D unrestricted TDHF fusion calculations using the full Skyrme interaction
• Heavy-ion interaction potential deduced from density-constrained TDHF calculation
• Microscopic sub-barrier fusion calculations for the neutron star crust
• Microscopic study of Ca$+$Ca fusion
• Fusion of neutron rich oxygen isotopes in the crust of accreting neutron stars
• Measurement of the Survival Probabilities for Hot Fusion Reactions
• Thermal conductivity and phase separation of the crust of accreting neutron stars
• The structure of accreted neutron star crust

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• Nuclear Quantum Many-Body Dynamics: From Collective Vibrations to Heavy-Ion Collisions (2nd edition)
• MuSIC@Indiana: an effective tool for accurate measurement of fusion with low-intensity radioactive beams
• Proton and neutron exchange as a prelude to fusion at near-barrier energies
• High-rate axial-field ionization chamber for particle identification of radioactive beams
• Assessing the impact of valence sd neutrons and protons on fusion
• Influence of additional neutrons on the fusion cross-section beyond the N=8 shell