Core deformation in 6Li arising from the tensor force

The T = 0, J = 1, 2 and 3 positive parity levels of a six nucleon system are calculated using single-particle orbitals derived from a deformed oscillator potential. Proper eigenfunctions of J² are projected through Hill-Wheeler integrals. Simplified forces are used so that the entire deformation is due to the tensor force. It is found that, to a very good approximation, all three levels may be generated from a single intrinsic function with constant size and deformation parameters. The derived level scheme indicates that the vector effects of the tensor force, previously calculated by second-order perturbation theory, are included in this model.