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Isomer decay tagging in the heavy nuclei: Ra210 and Ra209

J. J. Ressler1, C. W. Beausang1, H. Ai1, H. Amro1, M. A. Caprio1, R. F. Casten1, A. A. Hecht1, S. D. Langdown1,2, E. A. McCutchan1 et al.

D. A. Meyer1, P. H. Regan1,2, M. J. S. Sciacchitano1, A. Yamamoto1,2, and N. V. Zamfir1

  • 1A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
  • 2University of Surrey, Guilford, Surrey GU2 7XH, United Kingdom

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Phys. Rev. C 69, 034331 – Published 26 March, 2004

DOI: https://doi.org/10.1103/PhysRevC.69.034331

Abstract

Excited states in Ra210 and Ra209 were populated using the W184(Si30,xn) reaction at 148MeV beam energy. Fusion evaporation recoils were selected using the gas-filled spectrometer, SASSYER. Prompt γ rays were detected using Compton-suppressed Ge detectors from the YRAST Ball array surrounding the target. Delayed γ rays, following isomeric decays, were detected at the focal plane of SASSYER with a smaller array of Ge detectors. The decay energy and lifetime for the 8+(πh9∕2)n isomer of Ra210 were determined; values for the yrast B(E2;8+→6+) in Ra210 and neighboring nuclei are interpreted within the seniority scheme. This isomer was also used to select γ-rays deexciting levels above the isomeric state in Ra210. In addition, transitions in Ra209 were identified for the first time. Two high-spin isomers are suggested to exist in this isotope.

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Phys. Rev. C 69, 034331– Published 26 March, 2004
  • Received 23 December 2003

© 2004 American Physical Society

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