Abstract
Theβ −-decay of 16766 Dy produced through the fast neutron reaction170Er(n, α)167Dy has been investigated by using several kinds of detectors and a high-capacity two-parameter recording system. The half-life andβ −-decay energy of167Dy were determined to beT 1/2 = 6.20 ± 0.08min andQ β-=2.35±0.06, respectively. The observed level scheme of 16767 Ho (completely unknown previously) contains 12 states, among them a 6.0±0.1 μsM2 isomer at 259.3 keV. On the basis of theoretical and systematic considerations combined with multipole determinations, the following Nilsson model assignments are proposed for the lowest states of167Ho: 0 keV (7−/2 [523]), 259.3 keV (3+/2[411]), 319.8 keV (5/2 3+/2[411]), 392.5 keV (1+/2[411]), 410.0 keV (3/2 1+/2[411]), 569.7 keV (3−/2{7−/2[523], 2+}). Theβ-decay proceeds mainly to the proposed gamma-vibrational state at 569.7 keV with an anomalously low logft value 5.4, indicating similarity between the microscopic structures of this state and the famous ¦K 0−2¦ gamma vibration of165Ho.
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We wish to thank Professor Antti Siivola for discussions and critical reading of the manuscript. Two of us (T.T. and E.H.) are indebted to the Emil Aaltonen Foundation for financial support.
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Tuurnala, T., Katajanheimo, R. & Hammarén, E. States of167Ho from the decay of neutron rich nuclide167Dy. Z Physik A 280, 309–316 (1977). https://doi.org/10.1007/BF01434358
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DOI: https://doi.org/10.1007/BF01434358