Elsevier

Nuclear Physics A

Volume 170, Issue 3, 2 August 1971, Pages 593-606
Nuclear Physics A

Rotational bands in 161Ho

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Abstract

The excited states of the deformed odd-proton nucleus 161Ho have been studied in the reactions 159Tb(α, 2n), 161Dy(d, 2n) and 161Dy(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 161Ho contains besides of the ground state band 72[523] the bands 72+[404], 32+[411], 12+[411] and 12 [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 12+ [411] and 32+ [411], which are very close in energy. The 72+ [404] band was found to de-excite by very fast E1 transitions to the ground state band 72[523]. Nilsson retardation factors of about 0.03 for these transitions were deduced using the E2E1 branching ratios. An investigation has also been made of the independent feeding of the levels from high-lying states.

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