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Neutron Proton Pairing

April 24,2012, GANIL, Caen, France
FUSTIPEN Colloquium

« Neutron Proton Pairing »

April 24, 2012, GANIL, Caen, France


In N=Z nuclei, neutrons and protons occupy the same orbitals. This gives rise to unusual effects. In even-even nuclei, there is a large binding energy anomaly (Wigner energy). In odd-odd nuclei, there are ground state 0+ and 1+ doublets. Energy differences between orbitals in different shells, as deduced from binding energies along the N=Z line, disagree substantially with spacing calculated using Woods -Saxon single-particle potentials.

We shall discuss these phenomena in the framework of a model that includes T=1 and T=0 n-p pairing in addition to the usual T=1 n-n and p-p pairing. By including four nucleon correlations explicitly in variational wave functions, we can explain these phenomena in a particularly simple way. We shall also discuss the excited state spectrum arising from the generalized pairing Hamiltonian as well as an extension of this approach to include deformation.

 

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Marek Ploszajczak (GANIL)
Piet Van Isacker (GANIL)