A STUDY OF HIGH-SPIN STATES IN THE TRANSITIONAL NUCLEUS 90-MO

The reaction Ni-58(Ar-36, 4p)Mo-95 has been studied at a beam energy of 149 MeV A detector array consisting of the OSIRIS spectrometer (12 Compton-suppressed Ge detectors), four charged-particle DELTA-E detectors and seven NE-213 neutron detectors at the VICKSI accelerator in Berlin has been used to measure the gamma radiation in gamma-gamma- and particle-gamma-gamma-coincidence mode. An additional Ge detector was placed at 162-degrees to the beam direction to provide information on DCO ratios. The level scheme of "Mo has been extended up to an excitation energy of about 12 MeV and probable spin 23HBAR. Some 70 transitions and 40 levels have been newly identified. Spin assignments have been proposed on the basis of measured DCO ratios. Shell model calculations in a model space consisting of the proton 1f5/2, 2p3/2, 2p1/2, and 1g9/2 orbits and the neutron 2p1/2, 1g9/2, 1g7/2, 2 d5/2, 2d3/2, and 3s1/2 orbits with some truncation were made for states above 9HBAR and the predicted structure of these states is discussed.