MULTIPARTICLE-HOLE STATES OF HIGH-SPIN IN N-LESS-THAN-50, A-APPROXIMATE-TO-90 NUCLEI .1. THE TRANSITIONAL NUCLEUS TC-89(43)46

High spin states in the nucleus Tc-89 have been studied via the fusion evaporation reaction Ni-58(Ca-40,2 alpha p)Tc-89 at 180 MeV beam ener gy. The NORDBALL gamma-ray spectrometer equipped with auxiliary detect ors for light particle selection was used to measure gamma gamma- and particle-gamma gamma coincidences. Some 60 transitions were placed int o a level scheme comprising 38 levels reaching up to 9.2 MeV excitatio n energy and a possible spin of I = 45/2HBAR The level scheme is compa red to those of neighbouring nuclei and interpreted in terms of the sp herical shell model. The calculations were performed with different se ts of parameters within a restricted pi(p(1/2)), pi(g(9/2)), nu(p(1/2) ) and nu(g(9/2)) configuration space. States above 2.3 MeV excitation energy are well reproduced by shell model calculations based on an emp irical residual interaction, whereas collective excitations are sugges ted to contribute to the wave functions of lower lying states.