Sub-barrier fusion of 32S+90,96Zr: semi-classical coupled-channels approach

2010/05/05 by H. Q. Zhang, C. J. Lin, Zhang, H. Q. +19
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #nucl-ex

paper · pdf · doi:10.48550/arxiv.1005.0727

arxiv created 2010/05/05 · arxiv updated 2010/05/06

Abstract

The fusion excitation functions have been measured with rather good accuracy for 32S+90Zr and 32S+96Zr near and below the Coulomb barrier. The sub-barrier cross sections for 32S+96Zr are much larger compared with 32S+90Zr. Semi-classical coupled-channels calculations including two-phonon excitations are capable to describe sub-barrier enhancement only for 32S+90Zr. The remaining disagreement for 32S+96Zr comes from the positive Q-value intermediate neutron transfers in this system. The comparison with 40Ca+96Zr suggests that couplings to the positive Q-value neutron transfer channels may play a role in the sub-barrier fusion enhancement. A rather simple model calculation taking neutron transfers into account is proposed to overcome the discrepancies of 32S+96Zr.

Related

• Why does neutron transfer play different roles in sub-barrier fusion reactions ³²S+^94,96Zr and ⁴⁰Ca+^94,96Zr?
• Deciphering the influence of neutron transfer in Si-based fusion reactions around the Coulomb barrier
• Enhancement of fusion at near and sub-barrier energies for neutron-rich light nuclei
• Sub-barrier Fusion Cross Sections with Energy Density Formalism
• Effect of direct reaction channels on deep sub-barrier fusion in asymmetric systems