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 proposedπ i13/2 configuration isomer was observed in 209Fr, and its half-life was measured to be 446(14)ns. States above the isomer were also observed.

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Copyright © 2006 The American Physical Society. This article first appeared in Physical Review C 73, no. 2 (February 8, 2006): 024307-1-24307-8. doi:10.1103/PhysRevC.73.024307.

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