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Phys. Rev. C 73, 024307 (2006) [8 pages]

First investigation of excited states in the odd-proton nucleus 209Fr

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D. A. Meyer1, C. W. Beausang1,2, J. J. Ressler1,3, H. Ai1, H. Amro1, M. Babilon1,4, R. F. Casten1, C. R. Fitzpatrick1,5, G. Gürdal1,6, A. Heinz1, E. A. McCutchan1, C. Plettner1, J. Qian1, N. J. Thomas1,5, V. Werner1, E. Williams1, N. V. Zamfir1,7, and Jing-ye Zhang8
1Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124, USA
2Physics Department, University of Richmond, Richmond, Virginia 23173, USA
3Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A-1S6
4Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
5University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
6Clark University, Worcester, Massachusetts 01610, USA
7National Institute of Physics and Nuclear Engineering, Bucharest, Romania
8Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

Received 27 September 2005; published 8 February 2006

Excited states in 209Fr were produced following the 176Yb(37Cl, 4n) reaction. An excitation function was measured with data taken at 173, 179, and 185 MeV. Recoiling fusion-evaporation products were separated using the SASSYER gas-filled spectrometer. HPGe clover detectors of the YRAST Ball array at the target position and at the focal plane were used to detect prompt and delayed gamma ray decays, providing the first spectroscopic information about prompt and delayed transitions in 209Fr. The decay from a proposed πi13/2 configuration isomer was observed in 209Fr, and its half-life was measured to be 446(14)ns. States above the isomer were also observed.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.024307
DOI:
10.1103/PhysRevC.73.024307
PACS:
23.20.Lv, 21.10.Tg, 25.70.Gh, 27.80.+w
 
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