Microscopic structure of fundamental excitations in N=Z nuclei
Wojciech Satula, Ramon Wyss
Abstract
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 within the mean-field approach. It is shown that the underlying structure of these states can be determined in a consistent manner only when both isoscalar and isovector pairing collectivity as well as isospin projection, treated within the iso-cranking 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 iso-rotations (relevant for the case of T=1 states) explains the near-degeneracy of these fundamental excitations.
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