Science and Technology Production
No sub-Coulomb-barrier fusion enhancement due to positive Q -value two-neutron stripping: The O 18 + Ni 58 case
Articulo
Authorship:
Jia, H. M. ; Lin, C. J. ; Paes, B. ; Wen, P. W. ; Yang, L. ; Ma, N. R. ; Yang, F. ; Fan, Q. W. ; Zhang, R. ; Luo, T. P. ; Zhang, H. Q. ; Lubian, J.Date:
2025Publishing House and Editing Place:
American Physical SocietyMagazine:
Physical Review C, vol. 111 - ISSN 2469-9985American Physical Society
ISSN:
2469-9985Summary *
Coupling to transfer reactions is a long-standing problem in heavy-ion fusion at near-barrier energies. The 18O + 58Ni system, that was claimed to show a large sub-barrier fusion enhancement, is a typical case to demonstrate the coupled-channels effects of positive 𝑄-value two-neutron (2𝑛) transfer based on the existing experimental data. We remeasured the near-barrier fusion excitation function of 18O + 58Ni extending to lower energies by detecting the fusion evaporation residues. In order to understand the effects of couplings to neutron transfers, coupled-reaction-channels calculations by the code fresco were performed in a nonadjustable mode. Results show that couplings to low-lying collective excitations and one-neutron transfer are enough to explain the experimental fusion excitation function and barrier distribution. No evidence shows a sub-barrier fusion enhancement attributed to positive 𝑄-value 2𝑛 stripping. Information provided by the agent in SIGEVAKey Words
Fusion processTransfer reactionsNuclear reactionsNuclear fusion