New isotope227Rn and revised halflives for223Rn and226Rn

M. J.G. Borge, D. G. Burke, F. Calaprice, O. C. Jonsson, G. Løvhøiden, R. A. Naumann, K. Nybø, G. Nyman, H. L. Ravn, T. F. Thorsteinsen

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Neutron-rich isotopes of radon, produced by spallation reactions in a ThC2 target and selected chemically, were mass-separated and used as samples for radiation counting experiments. Assignments of the activities to radon isotopes were confirmed by genetic relationships to the previously known francium daughters. The halflife for the new isotope227Rn is 23±1 s and that for226Rn is 7.4±0.1 min. X-rays, γ-rays, and conversion electrons from the223Rn activity were measured. The decay patterns of K X-rays and known gamma transitions in the223Fr daughter yield a halflife of 23.2± 0.4 min for223Rn, in contrast to the value of 43± 5 min reported earlier. Energies, intensities, and likely multipolarities for the most prominent gamma transitions in the223Rn→223Fr decay are presented.

Original languageEnglish (US)
Pages (from-to)429-434
Number of pages6
JournalZeitschrift für Physik A Atomic Nuclei
Issue number4
StatePublished - Dec 1986

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • 23.20.Lv
  • 23.20.Nx
  • 27.90.+b


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