We discuss the implications of partial dynamical SU(3) symmetry (PDS) for the structure of the lowest K =0+ (K=02) collective excitation in deformed nuclei. We consider an interacting boson model Hamiltonian whose ground and γ bands have good SU(3) symmetry, while the K=02 band is mixed. It is shown that the double-phonon components in the K=02 wave function arise from SU(3) admixtures which, in turn, can be determined from absolute E2 rates connecting the K=02 and ground bands. An explicit expression is derived for these admixtures in terms of the ratio of K=02 and γ bandhead energies. The SU(3) PDS predictions are compared with existing data and with broken-SU(3) calculations for 168Er.
|Original language||American English|
|Number of pages||5|
|Journal||Physical Review C - Nuclear Physics|
|State||Published - Dec 1999|