Levels of 89Nb populated in the 89Y(3He, 3nγ) reaction

Abstract The excited states of 89 Nb has been studied by means of ( 3 He, 3nγ) in-beam γ-ray spectroscopy. A level scheme has been constructed containing eight new levels: 1003.4( 13 2 + ), 1935.1( 17 2 + ), 2150.S( 21 2 + or 17 2 − ), 2192.3( 21 2 + or 17 2 − ), 2516.8, 2521.8, 2955.1 and 3402.3 keV. The 2192.3 keV level has been identified as a high-spin isomer with T 1 2 = 15±5 ns . The structure of the 89 Nb level scheme is treated in terms of a weak coupling model.