Coexistence of collective and quasiparticle structures in 106Sn and 108Sn

Abstract New levels in the neutron deficient nuclei 106 Sn and 108 Sn have been investigated by using the NORDBALL detector array combined with charged particle and neutron detectors. The excited structures are discussed in terms of collectivity and the shell model. The excitations are interpreted to be based on d 5 2 , g 7 2 and h 11 2 both for protons and neutrons and g 9 2 for protons. The systematical behaviour of the specific states in the Sn isotopes is studied in the mass range of A = 106–118.