Structure of the145Sm states from the145Eu Decay

The γ-radiation from145Eu has been studied by means of an anti-Compton spectrometer, the construction and operation of which are described. Altogether 91 γ-transitions have been observed, 20 of them for the first time. A decay scheme of145Eu has been constructed incorporating 85 γ-transitions. Low-lying excited states in145Sm have been analysed within the quasiparticle-phonon nuclear model as well as within the interacting boson-fermion model. Some systematic features in the positions of low-lying positive parity levels inN=83 nuclei have been revealed.