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Fission and gamma-ray decay of the238U shape isomer

  • Neuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

The decay of the238U superdeformed shape isomer has been reinvestigated by detecting for the first time simultaneously the fission and the gamma-back decay. An electrostatic deflection system has been used to transport the238mU recoils, produced in a238U(d, pn) reaction with a pulsed beam of 18 MeV deuterons, in front of a detector set-up consisting of three ion-implanted solidstate detectors and a Ge(Li) gamma-detector. The gamma-back decay has been measured in coincidence with conversion electrons of the 2+ → 0+ transition deexciting the first rotational state in238U. Two gamma-transitions of 2.513 MeV and 1.878 MeV have been observed with half-lives consistent with the result obtained for the decay by delayed fissionT 1/2=(298±18) ns.

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Author notes

  1. M. Steinmayer

    Present address: Max-Planck Institut für extraterrestrische Physik, W-8046, Garching, Federal Republic of Germany

  2. L. Corradi & K. Rudolph

    Present address: Laboratori Nazionali di Legnaro, INFN, Padova, Italy

  3. U. Quade

    Present address: Gesellschaft für Reaktorsicherheit, W-8046, Garching, Federal Republic of Germany

  4. P. R. Pascholati (Fellow of CNPq)

    Present address: Instituto de Fisica-VSP, 01498, São Paulo, Brasil

  5. W. Schomburg

    Present address: Kernforschungszentrum Karlsruhe GmbH, W-7500, Karlsruhe, Federal Republic of Germany

Authors and Affiliations

  1. Sektion Physik, Universität München, Am Coulombwall 1, W-8046, Garching, Federal Republic of Germany

    M. Steinmayer, K. E. G. Löbner, L. Corradi, U. Lenz, U. Quade, P. R. Pascholati (Fellow of CNPq), K. Rudolph & W. Schomburg

  2. Max-Planck Institut für extraterrestrische Physik, W-8046, Garching, Federal Republic of Germany

    W. Schomburg

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  1. M. Steinmayer
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Additional information

Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday

We would like to thank Dr. H.J. Maier and his staff of the target laboratory for the preparation of the targets and Dr. J. Kemmer of the detector laboratory of the Technical University for the support with ion-implanted solid-state detectors. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06 LM 177.

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Steinmayer, M., Löbner, K.E.G., Corradi, L. et al. Fission and gamma-ray decay of the238U shape isomer. Z. Physik A - Hadrons and Nuclei 341, 145–154 (1992). https://doi.org/10.1007/BF01298474

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  • DOI: https://doi.org/10.1007/BF01298474

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