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Recoil distance lifetime measurements in82Kr

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The lifetimes τ=124±12, 6 +4−2 and 380±100 ps of theE x (I π)=3.46(8+), 2.92(6+) and 3.04(6−) MeV states, respectively, populated by the reaction76Ge(12C,α2n) were measured with the recoil distance method. In addition upper lifetime limits were obtained for nine states. The measured lifetimes and energies indicate a band crossing at aboutI π=8+, probably arising from the alignment of twog 9/2 neutrons. For the 3.04 MeV 6− state as a second member of a band built on the 2.65 MeV 4− state the measured lifetime points to a two-quasiparticle configuration. The positive-parity states have been discussed in the frame of the interacting boson approximation, nuclear field theory and the cranked shell model.

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Author notes

  1. J. Keinonen

    Present address: University of Helsinki, Finland

Authors and Affiliations

  1. II. Physikalisches Institut der Universität, Göttingen, Federal Republic of Germany

    S. Brüssermann, J. Keinonen, H. P. Hellmeister & K. P. Lieb

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  1. S. Brüssermann
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  2. J. Keinonen
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  3. H. P. Hellmeister
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  4. K. P. Lieb
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Additional information

Work supported by Deutsches Bundesministerium für Forschung und Technologie

The authors are indebted to Dr. R.A. Broglia, Dr. K. Eskola, Dr. A. Sedlmayr and Dr. E. Maglione for the permission to quote unpublished results. They furthermore thank J. Panqueva, F.J. Bergmeister and L. Lühmann for their help in data taking. The advice of U. Kaup in using the IBA-2 code is appreciated.

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Brüssermann, S., Keinonen, J., Hellmeister, H.P. et al. Recoil distance lifetime measurements in82Kr. Z Physik A 304, 335–341 (1982). https://doi.org/10.1007/BF01421515

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