Elsevier

Nuclear Physics A

Volume 194, Issue 1, 16 October 1972, Pages 177-192
Nuclear Physics A

Decay of 161Er to 161Ho

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Abstract

The level scheme of the deformed odd-proton nucleus 161Ho was investigated in the electron-capture decay of 161Er using germanium detectors, a magnetic β-spectrograph and two π√2 double-focussing β-spectrometers. In addition to the measurements of singles γ-ray and conversion-electron spectra extensive γ-γ coincidence measurements were performed. A decay scheme is proposed involving 37 excited states in 161Ho. In the low-energy region the first members of the rotational bands 72-[523], 12+[411], 72+[404], 32 +[4411], 12[541], 52+[413] and52[532] were identified. Furthermore, the first two members of the γ-vibrational band K0-2M built on the ground state and an additional band with the probable quantum characteristic Kπ = 52+ (band head at 446.9 keV) have been found. Possible interpretations of the high-lying levels are discussed on the basis of current models.

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On leave from the Polytechnical Institute, Tashkent, USSR.

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