Abstract
The high-spin level structure of the Er-153 nucleus has been reinvestigated by in-beam gamma-ray and electron spectroscopy with (N-14,pxn) reaction. Excitation energies, spin and parity assignments are unambiguously established for the two lowest isomers T-1/2 similar or equal to 380 ns and T-1/2 similar or equal to 10 nS The characteristics of the third one (T-1/2 similar or equal to 250 ns) at 5.2 MeV are still questionable but its main decay modes are better known. An extension of the level scheme is proposed up to 8.4 MeV. Experimental results have been discussed in terms of shell model multiplets and compared with the other structures observed in N = 85 neighbouring nuclei.