Isospin singlet (pn) pairing and quartetting contribution to the binding energy of nuclei - art. no. 024306

Isospin singlet (pn) pairing as well as quartetting in nuclei is expected t o arise near the symmetry Line N = Z. Empirical values can be deduced from the nuclear binding energies applying special filters. Within the local den sity approximation, theoretical estimates for finite nuclei are obtained fr om results for the condensation energy of asymmetric nuclear matter. It is shown that the isospin singlet condensation energy drops down abruptly for \N-Z\ approximate to 4 for medium nuclei in the region A = 40. Furthermore, alpha-like quartetting and the influence of excitations are discussed.