Abstract
Abstract The types of configuration necessary to describe the observed static quadrupole moment of an excited J π = 3 − state and its octupole transition rate to the ground state are investigated for the first excited 3 − state of 208 Pb. It is done by calculating the range of B (E3) values and quadrupole moments that simultaneously exist within a variety of configuration spaces. The spaces investigated include those of the TDA and RPA particle-hole models and models in which particle-hole excitations are coupled to a 2 + phonon. It is shown that it would be extremely difficult for any of the models considered to explain the observed properties of the above state.
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