Subbarrier Fusion of the Oxygen Isotopes

Author: Pönisch, Volker

Year: 1986

Degree: Dissertation (Ph.D.)

Advisor: Koonin, Steven E.

Committee Members: Koonin, Steven E.; Barnes, Charles A.; Prince, Thomas A.; Politzer, Hugh David; Winther, Aage

Option: Physics

DOI: 10.7907/KZX1-P789

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.

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