STUDY OF HIGH-SPIN STATES IN TB-149 OBSERVED BY THE (B-10,3N) REACTION

Energy levels in **1**4**9Tb have been studied by the **1**4**2Nd (**1**0B,3n) reaction using 54 MeV **1**0B beams from the McMaster University FN accelerator. Excitaton functions, angular distributions, prompt gamma - gamma coincidence, electron conversion, and linear polarization measurements were obtained. On the basis of these measurements the authors have identified two rotation-aligned pi h//1//1/////2 bands, a negative parity band up to spin 27/2** minus , and a positive parity band up to spin 27/2** plus . The energy spacings between levels in these bands strongly resemble those in the ground state and the 3** minus octupole band of the adjacent **1**4**8Gd core nucleus. Other high spin positive parity states up to spin of 41/2 are also observed. These high spin states show some evidence of rotational structure in **1**4**9Tb.