Subbarier Fusion of the Oxygen Isotopes

Citation

Pönisch, Volker (1986) Subbarier Fusion of the Oxygen Isotopes. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/KZX1-P789. https://resolver.caltech.edu/CaltechTHESIS:06302010-080153741

Abstract

The subbarrier fusion process is studied for systems involving oxygen isotopes. A one-channel incoming wave boundary condition (IWBC) calculation gives an excellent fit to fusion cross section data for ¹⁶O+¹⁶O. An IWBC coupled channels calculation for ¹⁷O+¹⁶O that includes inelastic excitations as well as one-neutron transfer with formfactors calculated in a consistent single-particle framework reproduces the subbarrier enhancement down to four fifths the barrier height, but not below that. The calculation does not invoke the adiabatic approximation, which would create non-unitarity in the coupled channels equations. The measured subbarrier fusion cross section for ¹⁸O+¹⁶O is well reproduced by an IWBC coupled channels calculation with two-neutron transfer, but the calculation disagrees with the above-barrier data.

Thesis Files