1ST IDENTIFICATION OF DIPOLE EXCITATIONS TO A 2-TIMES-3-CIRCLE-TIMES PARTICLE MULTIPLET IN AN ODD-A NUCLEUS(CIRCLE)

A photon scattering experiment has been performed on the odd-A nucleus Nd-143. Strong dipole excitations have been detected in the energy re gion around 3.2 MeV. This is near the expected position of the two-pho non (2+ x 3-) multiplet in the even-even neighboring nucleus Nd-142. T he summed dipole strength between 2.8 and 3.6 MeV in Nd-143 is in agre ement with the sum rule for weak particle coupling to the core nucleus Nd-142. Model calculations in a harmonic approximation are in very go od agreement with the experiment and they suggest a two-phonon (2+ x 3 -) particle structure of the excitations in Nd-143.