Nuclear structure studies of Te-123 with (n, gamma) and (d, p) reactions

Levels in Te-123 were investigated in the range up to 3 MeV excitation ener gy by (n, gamma) and (d, p) reactions. Over 120 levels and about 140 gamma- transitions were established most of them for the first time. The states be low 2 MeV with the most complete spectroscopic information were interpreted in terms of the Interacting Boson-Fermion Model (IBFM). Unified treatment of both positive- and negative-parity states is achieved with constant para meters of the boson-fermion interaction for the whole chain of Te isotopes. Excitation energies, electromagnetic transition rates, gamma-branchings an d spectroscopic factors are discussed in connection with their possible str ucture. A family of low-spin negative-parity states has been identified and understood within the IBFM framework, thus proving their antialigned origi n. (C) 2000 Elsevier Science B.V. All rights reserved.