Vibrational levels in the 86-neutron nucleus Gd150

D. R. Haenni and T. T. Sugihara
Phys. Rev. C 16, 1129 – Published 1 September 1977
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Abstract

The decay of 3.6-h Tb150 to levels in Gd150 has been studied by γ-ray and conversion-electron spectroscopy. A level scheme is proposed which accounts for all but 35 of the 256 γ rays assigned to this decay. Most of the low-lying levels in Gd150 show a remarkably close correspondence with the predictions of the simple vibrator model. Possible candidates are observed for three-phonon quadrupole states and for the states coupling quadrupole and octupole phonons. The low-lying positive-parity levels can be adequately described by the phenomenological collective model of Gneuss and Greiner. The microscopic boson-expansion model of Kishimoto and Tamura, however, appears to predict Gd150 to be more transitional than the data imply. Systematics of the 86-neutron isotones show increased stability at 64 protons. This can be correlated with the filling of the g72 and d52 spherical proton orbitals.

RADIOACTIVITY Tb150 [from Eu151(He3,4n)], measured T12, Eγ, Eβ+, Iγ, Ice, γγ, and β+γ coin; deduced Q, logft. Gd150 deduced levels, ICC, J, π. Enriched target, Ge(Li), and Si(Li) detectors.

  • Received 26 October 1976

DOI:https://doi.org/10.1103/PhysRevC.16.1129

©1977 American Physical Society

Authors & Affiliations

D. R. Haenni* and T. T. Sugihara

  • Cyclotron Institute, Texas A & M University, College Station, Texas 77843

  • *Present address: KFA Jülich, 517 Jülich, West Germany.

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Vol. 16, Iss. 3 — September 1977

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