LEVELS OF BA-137 STUDIED WITH NEUTRON-INDUCED REACTIONS

The nucleus Ba-137 has been studied via primary and secondary gamma-ra ys as well as gamma gamma-coincidences following thermal-neutron captu re and inelastic neutron scattering. A level scheme was established up to 4.7 MeV consisting of 37 levels including 91 transitions. The neut ron binding energy was determined to be 6905.59(8) keV. The thermal-ne utron-capture cross section and isomer production of the 11-/2 state a t 661.6 keV were determined to be 0.65(-0.04)(+0.08) and 0.0098(4) b r espectively. The experimental data on excitation energies and electrom agnetic properties are compared with predictions of the SU(5) limit of the interacting boson-fermion model. A satisfactorily good agreement between experiment and theory can be stated.