COMPLETE LEVEL SCHEME OF TE-124 UP TO 3 MEV

Excited states of Te-124 were measured with the transfer reactions Te- 123(d,p) Te-124, Te-125(d,t) Te-124 and Sb-123(He-3,d) Te-124 and with the inelastic scattering reaction Te-124(p,p') Te-124 at the Tandem A ccelerator in Munich. Levels were obtained up to 3.5 MeV with energy r esolutions of 3-6 keV. The Te-124(gamma, gamma') Te-124 reaction was s tudied at the S-DALINAC accelerator in Darmstadt for bremsstrahlung en dpoint energies E(0) = 3.5 and 5 MeV. The Te-123(n, gamma) Te-124 reac tion with thermal neutrons was investigated in Riga and in Dubna inclu ding gamma-gamma coincidences. In Dubna the special method of sum coin cidences was applied, analyzing the gamma-gamma cascades to the ground state and the first 2(+) level. Based on these experiments a level sc heme was constructed with states up to 4.5 MeV which is assumed to be complete up to 3 MeV for angular momenta J < 4HBAR. A quasiparticle-ph onon model calculation with a configuration space of up to three-phono n coupling permits a good description for many of the low-energy state s. Transition probabilities, E2/M1 mixing ratios and branching ratios between these levels are generally well described. The quantitative re production indicates a two-phonon quadrupole-octupole coupled 1(-) str ucture of the states most strongly excited in the (gamma, gamma') reac tion. The 2(-) member of the 2(1)(+) x 2(1)(+) x 3(1)(-) septuplet is identified in the unusual decay cascade following thermal neutron capt ure. A candidate for a 2(+) state with mixed symmetry structure is pro posed.