title: Microscopic structure of fundamental excitations in N = Z nuclei.
abstract: An extended mean-field model is presented that describes states of different isospin in odd-odd and even-even nuclei. Excitation energies of the T = 1 states in even-even as well as T = 0 and T = 1 states in odd-odd N = Z nuclei are calculated. It is shown that the structure of these states can be determined in a consistent manner when both isoscalar and isovector pairing collectivity as well as isospin projection (treated here within the isocranking approximation) are taken into account. In particular, in odd-odd N = Z nuclei, the interplay between quasiparticle excitations (relevant for the case of T = 0 states) and isorotations (relevant for the case of T = 1 states) explains the near degeneracy of these states.
authors.affiliation: Royal Institute of Technology, Frescativ. 24, S-104 05 Stockholm, Sweden.
authors.forename: W
authors.initials: W
authors.lastname: Satuła
authors.forename: R
authors.initials: R
authors.lastname: Wyss