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A 45 ns 8+ isomer in the doubly odd150Eu nucleus

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

In the doubly odd 15063 Eu87 nucleus a 45 ns 8+ isomer at 589 keV excitation has been identified through (p, 3n) in beamγ ande − measurements. The low lying negative parity levels populated in its decay show great similarity to analogous states in the lighter odd-odd Eu neighbours suggesting a spherical shape for150Eu. A spherical shape is also proposed for the isomer which is assigned as (πh 11/2 vf 2/−37 )8+ state analogous to the 9+ isomers known in148Eu and146Eu. The spin change is attributed to the crossing of the half-filledf 7/2 neutron shell atN=86.

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Author notes

  1. F. Soramel-Stanco

    Present address: C.S.N.S.M., Bât. 104, F-91406, Orsay, France

  2. J. Styczen

    Present address: Institute of Nuclear Physics, PL-31-342, Cracow, Poland

  3. R. Julin (A. v. Humboldt fellow 1981–82)

    Present address: Department of Physics, University of Jyväskylä, Seminaarinkatu 15, SF-40100, Jyväskylä 10, Finland

  4. P. T. Prokofjev

    Present address: Physics Institue, Latvian SSR Academy of Sciences, 229021, Riga-Salaspils 1, USSR

Authors and Affiliations

  1. Institut für Kernphysik, KFA Jülich, Federal Republic of Germany

    F. Soramel-Stanco, R. Julin (A. v. Humboldt fellow 1981–82), J. Styczen, P. T. Prokofjev, A. Ercan & P. Kleinheinz

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  1. F. Soramel-Stanco
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Additional information

on leave from University of Jyväskylä, Finland

On leave from Physics Institute, Latvian SSR Academy of Sciences, 229021 Riga-Salaspils 1, USSR

We thank P. Wieder for his competent help with the experiments, and M. Karnadi for invaluable assistance with the data analysis. We acknowledge help from H. Mattheß during the early stages of this work. For fruitful discussions we are indebted to S. Lunardi, C. Signorini, M. Piiparinen, R.G. Lanier and O. Schult. One of us (P.T.P.) acknowledges financial support from the Deutsche Forschungsgemeinschaft during a sabbatical visit at Jülich.

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Soramel-Stanco, F., Julin, R., Styczen, J. et al. A 45 ns 8+ isomer in the doubly odd150Eu nucleus. Z Physik A 314, 127–133 (1983). https://doi.org/10.1007/BF01879870

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  • DOI: https://doi.org/10.1007/BF01879870

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