THE DECAY OF Er171

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Abstract
The decay of Er171 has been studied with a magnetic beta-ray spectrometer at a resolution of 0.5%. The energies and intensities of 30 transitions in Tin171 have been established. The energies (Mev) and intensities (%) are as follows: 0.086 (~0.1), 0.1117 (68.8), 0.1166 (6.05), 0.1240 (20.5), 0.1664 (0.65), 0.2104 (0.67), 0.2364 (0.57), 0.2770 (0.74), 0.2956 (28.7), 0.3082 (64.4), 0.3712 (~0.4), 0.4040 (0.03), 0.4189 (0.09), 0.5437 (0.04), 0.5571 (0.08), 0.5727 (0.07), 0.6061 (0.10), 0.6187 (0.13), 0.6703 (0.30), 0.6753 (0.39), 0.7321 (0.18), 0.738 (0.06), 0.7835 (0.31), 0.7962 (0.80), 0.842 (0.04), 0.869 (0.06), 0.882 (0.07), 0.906 (0.88), 0.9105 (0.25), 0.962 (0.11). These transitions are interpreted in terms of 12 levels whose energies and spins are: 0 (1/2+), 0.0051 (3/2+), 0.1167 (5/2+), 0.1291 (7/2+), 0.4251 (7/2−), 0.5915 (9/2−), 0.6355 (7/2+), 0.675(3/2+), 0.737 (5/2+), 0.912 (5/2+), 0.963 (5/2+), 0.997 (7/2+). The decay energy of Er171 is 1.490±0.002 Mev.