Abstract
Abstract The excited states of the deformed odd-proton nucleus 161 Ho have been studied in the reactions 159 Tb(α, 2n), 161 Dy(d, 2n) and 161 Dy(p, n). Gamma-ray spectra in single and coincidence modes as well as angular distributions and excitation functions of the transitions were measured. The proposed level scheme of 161 Ho contains besides of the ground state band 7 2 − [523] the bands 7 2 + [404], 3 2 + [411], 1 2 + [411] and 1 2 − [541] (band heads at 252.7, 298.7, 211.2 and 423.9 keV, respectively). An attempt was made to estimate the influence of Coriolis coupling between the bands 1 2 + [411] and 3 2 + [411], which are very close in energy. The 7 2 + [404] band was found to de-excite by very fast E1 transitions to the ground state band 7 2 − [523]. Nilsson retardation factors of about 0.03 for these transitions were deduced using the E2 E1 branching ratios. An investigation has also been made of the independent feeding of the levels from high-lying states.
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