Abstract
The yrast states of148Dy and149Dy have been studied by γ-ray and conversion electron measurements in (α, xn) and (16O,xn) reactions on enriched152Gd and135Ce targets. Level schemes to above 4 MeV for the two nuclei are reported. The πh 2 11/2 spectrum identified in148Dy and the πh 11/2 effective chargee eff=1.52±0.05e, derived from the measuredE2 transition rate between the (πh 2 11/2) 10+ and 8+ states, are discussed and compared with results for other two-particle nuclei. The yrast cascades in148Dy and149Dy continue above the (πh 2 11/2) 10+ and πh 2 11/2 vf 7/2) 27/2− states by ∼ 1 MeVE1 transitions de-exciting the lowest members of octupole multiplets built on these states. The energy shifts for the observed members of the πh 2 11/2 × 3− multiplet are analyzed in terms of twoparticle-phonon exchange coupling using an empirical coupling strength extracted from the one valence particle nucleus147Tb. The dominantvf 7/2×3− character of low-lying 13/2+ isomers in149Dy and otherN=83 nuclei is emphasized.
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Supported in part by the U.S. Department of Energy
We thank L. Richter, Y. Nagai, M. Ogawa, M. Piiparinen and A. Stefanini for their assistance in some of the measurements, and R. Wagner for preparing the enriched target materials, especially the thin136Ce targets vital for the conversion electron measurements. Fruitful discussions with O. Schult are also gratefully acknowledged.
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Daly, P.J., Kleinheinz, P., Broda, R. et al. Protonh 2 11/2 and octupole excitations in148 66Dy82 and149 66Dy83 . Z Physik A 298, 173–185 (1980). https://doi.org/10.1007/BF01418655
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DOI: https://doi.org/10.1007/BF01418655