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Alpha- and EC-decay measurements of 257Rf

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Abstract.

Alpha- and Electron capture (EC) decay properties of 257 Rf were investigated by measuring \( \alpha\) - \( \gamma\) coincidences and correlations between conversion electrons (CE) emitted during the process of EC decay of 257Rf and \( \alpha\) decays of the daughter isotope 257Lr. So far, previously unobserved \( \alpha\) (8296 keV)- \( \gamma\) (557 keV) coincidences were measured and interpreted as decays of 257mRf ( \( 11/2^{-}[725]\) into the \( 7/2^{-}[743]\) level in 253No. A search of delayed coincidences between \( \alpha\) particles and signals at \( E \le 1000\) keV, which are interpreted as being due to CE emission, revealed a clear correlation between CE and \( \alpha\) particles from the decay of 257Lr, which is regarded as a direct proof of the EC decay of 257gRf and 257mRf.

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Authors and Affiliations

  1. GSI - Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany

    F. P. Heßberger, A. K. Mistry, D. Ackermann, M. Block, B. Kindler, I. Kojouharov, M. Laatiaoui & B. Lommel

  2. Helmholtz Institut Mainz, 55099, Mainz, Germany

    F. P. Heßberger, A. K. Mistry, M. Block & M. Laatiaoui

  3. Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248, Bratislava, Slovakia

    S. Antalic, B. Andel & Z. Kalaninova

  4. Johannes Gutenberg-Universität Mainz, 55128, Mainz, Germany

    M. Block

  5. GANIL, 14076, Caen Cedex 5, France

    J. Piot & M. Vostinar

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  1. F. P. Heßberger
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Correspondence to F. P. Heßberger.

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Communicated by N. Kalantar-Nayestanaki

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Heßberger, F.P., Antalic, S., Mistry, A.K. et al. Alpha- and EC-decay measurements of 257Rf. Eur. Phys. J. A 52, 192 (2016). https://doi.org/10.1140/epja/i2016-16192-0

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