Abstract
The level structure of theN=81 nucleus149Er has been studied by γ-ray spectroscopy following the reaction92Mo+255 MeV60Ni. Yrast levels in149Er are established up to ~3.3 MeV, including 0.61 and 4.8 μs isomeric states. Most of the observed levels are interpreted as seniority-three states arising from the coupling of s1/2, d3/2 and h11/2 neutron holes with πh 2/n11 . Isomers identified in the reaction96Ru+255 MeV58Ni are tentatively assigned to151Yb. TheB (E2) values of high-spin isomers inZ=66−70,N=81−83 nuclei are surveyed.
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Work supported by the U.S. Department of Energy under Contract Nos. DE-AC02-76ER01672 and W-31-109-Eng-38
We thank J. Blomqvist and R.D. Lawson for useful discussions.
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Broda, R., Daly, P.J., McNeill, J. et al. Level structure of 14968 Er81 and high-spin isomerism in proton-richN=81, 82, 83 nuclei. Z. Physik A - Atomic Nuclei 327, 403–408 (1987). https://doi.org/10.1007/BF01289565
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DOI: https://doi.org/10.1007/BF01289565