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Alpha decay of neutron-deficient rhenium and osmium isotopes

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Neutron-deficient osmium and rhenium isotopes were produced by bombarding an enriched144Sm target with beams of27Al and28Si. Previously reported decay data concerning168,169,170Os were confirmed. Three newα groups, observed in the144Sm+27Al reaction, were assigned to the decay of166,167,168Re based on excitation functions,α-energy systematics and theoretical half-life predictions. Their decay properties are:

$$\begin{gathered} {}^{166}\operatorname{Re} , E_\alpha = 5,372 (10) keV, T_{1/2} = 2.8 (3) s; \hfill \\ {}^{167}\operatorname{Re} , E_\alpha = 5,136 (8) keV, T_{1/2} = 6.1 (2) s and \hfill \\ {}^{168}\operatorname{Re} , E_\alpha = 4,894 (10) keV, T_{1/2} = 6.9 (8) s. \hfill \\ \end{gathered}$$

It is proposed that twoα groups, observed in the144Sm+28Si reaction, originate from isomeric states in168,169Re. Our measured data for the isomeric states are:

$$\begin{gathered} {}^{168m}\operatorname{Re} , E_\alpha = 5,250 (10) keV, T_{1/2} = 6.6 (15) s and \hfill \\ {}^{169m}\operatorname{Re} , E_\alpha = 5,050 (10) keV, T_{1/2} = 12.9 (11) s. \hfill \\ \end{gathered} $$

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Author notes

  1. U. J. Schrewe (Fellow of the Deutsche Forschungsgemeinschaft 1981)

    Present address: II. Physikalisches Institut der Universität, D-3400, Göttingen, FRG

  2. K. S. Sharma

    Present address: Physics Department, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada

Authors and Affiliations

  1. University of Toronto, M5S 1A7, Toronto, Ontario, Canada

    V. T. Koslowsky

  2. Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, Canada

    U. J. Schrewe (Fellow of the Deutsche Forschungsgemeinschaft 1981), E. Hagberg, H. Schmeing, J. C. Hardy, V. T. Koslowsky & K. S. Sharma

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  1. U. J. Schrewe
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  2. E. Hagberg
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  3. H. Schmeing
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  4. J. C. Hardy
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  5. V. T. Koslowsky
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  6. K. S. Sharma
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Additional information

We would like to thank Prof. Y. LeBeyec for stimulating discussions. One of us (U.J.S.) is indebted to the Deutsche Forschungsgemeinschaft for granting a fellowship and also to AECL for kind hospitality and excellent working conditions.

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Schrewe, U.J., Hagberg, E., Schmeing, H. et al. Alpha decay of neutron-deficient rhenium and osmium isotopes. Z Physik A 315, 49–55 (1984). https://doi.org/10.1007/BF01436208

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  • DOI: https://doi.org/10.1007/BF01436208

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