Dipole excitations in the vibrational nucleus Cd-112 - art. no. 024308

The strength distribution of low-lying dipole excitations in the medium-wei ght vibrational nucleus Cd-112 was investigated by means of nuclear resonan ce fluorescence experiments (NRF) performed at the bremsstrahlung beam of t he Stuttgart Dynamitron accelerator (end-point energy 4.1 MeV). Detailed in formation on excitation energies, spins, decay widths, and transition proba bilities of about 20 new spin-1 states in Cd-112 has been obtained. In comp arison with comprehensive spectroscopic information available for Cd-112 co nclusions on the parities of the lowest states can be made. A strongly exci ted J(pi) = 1(-) state is interpreted as the 1(-) member of the quadrupole- octupole coupled quintuplet. The observed transition intensities are descri bed in the framework of the interacting boson model and compared with those obtained from recent nuclear resonance fluorescence experiments on the nei ghboring Cd isotopes (113,) Cd-114. [S0556-2813(99)01508-3].