Wigner term generated by isovector p-n pairing
1 Department of Physics, University of Notre Dame, Notre Dame, IN 46556
2 Department of Chemistry and Physics, Saint Mary’s College, Notre Dame, IN 46556
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Published online: 19 December 2013
The linear term proportional to |N – Z| in the nuclear symmetry energy (Wigner energy) is obtained in a model that uses isovector pairing on single particle levels from a deformed potential combined with a interaction. The pairing correlations are calculated by numerical diagonalization of the pairing Hamiltonian acting on the six or seven levels nearest the N = Z Fermi surface. The experimental binding energies of nuclei with N ≈ Z are well reproduced. The Wigner energy emerges as a consequence of restoring isospin symmetry.
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