摘要: Abstract Order and chaos order-to-chaos transition are treated in terms of nuclear wave functions. A quasiparticle-phonon interaction is responsible for the fragmentation one- many-quasiparticle phonon states mixing closely spaced states. Complete damping one-quasiparticle cannot be considered as a to due large or their An experimental investigation strength distribution should uncover new region regularity nuclei at intermediate excitation energy. chaotic behaviour can shifted higher energies.