Decay of 201203Ra and 200202Fr

Z. Kalaninová, S. Antalic, A. N. Andreyev, F. P. Heßberger, D. Ackermann, B. Andel, L. Bianco, S. Hofmann, M. Huyse, B. Kindler, B. Lommel, R. Mann, R. D. Page, P. J. Sapple, J. Thomson, P. Van Duppen, and M. Venhart
Phys. Rev. C 89, 054312 – Published 12 May 2014

Abstract

Decay properties of the neutron-deficient nuclides 201203Ra and 200202Fr were investigated using α- and γ-decay spectroscopy. The nuclei were produced in fusion-evaporation reactions of 56Fe projectiles with enriched 147Sm and 149Sm targets at the velocity filter SHIP at GSI in Darmstadt (Germany). The α decay from the (3/2) state in 201Ra was identified with an energy Eα=7842(12) keV and half-life T1/2=84+40 ms. Ambiguous decay properties for 202Ra from previous measurements were clarified by remeasuring with significantly improved precision, resulting in values of Eα=7722(7) keV and T1/2=3.80.8+1.3 ms. New short-lived isomeric states were identified in 200Fr and 201Fr with half-lives of 0.60.2+0.5 μs and 0.70.2+0.5 μs, respectively. A tentative spin and parity of 13/2+ were assigned to the latter. One event attributed to β-delayed fission of 200Fr was observed.

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  • Received 21 March 2014

DOI:https://doi.org/10.1103/PhysRevC.89.054312

©2014 American Physical Society

Authors & Affiliations

Z. Kalaninová1,*, S. Antalic1, A. N. Andreyev2,3, F. P. Heßberger4,5, D. Ackermann4, B. Andel1, L. Bianco6, S. Hofmann4, M. Huyse7, B. Kindler4, B. Lommel4, R. Mann4, R. D. Page6, P. J. Sapple6, J. Thomson6, P. Van Duppen7, and M. Venhart8,1

  • 1Department of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, Slovakia
  • 2Department of Physics, University of York, York YO10 5DD, United Kingdom
  • 3Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
  • 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 5Helmholtz Institut Mainz, 55099 Mainz, Germany
  • 6Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 7KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
  • 8Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia

  • *zdenka.kalaninova@fmph.uniba.sk

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Vol. 89, Iss. 5 — May 2014

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