Discovery of 229Rn and the structure of the heaviest Rn and Ra isotopes from Penning-trap mass measurements.

Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
Physical Review Letters (Impact Factor: 7.73). 04/2009; 102(11):112501. DOI: 10.1103/PhysRevLett.102.112501
Source: PubMed

ABSTRACT The masses of the neutron-rich radon isotopes {223-229}Rn have been determined for the first time, using the ISOLTRAP setup at CERN ISOLDE. In addition, this experiment marks the first discovery of a new nuclide, 229Rn, by Penning-trap mass measurement. The new, high-accuracy data allow a fine examination of the mass surface, via the valence-nucleon interaction deltaV{pn}. The results reveal intriguing behavior, possibly reflecting either a N=134 subshell closure or an octupolar deformation in this region.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We report here recent developments of Forced Electron Beam Induced Arc Discharge (FEBIAD) ion sources at the ISOLDE radioactive ion beam facility, hosted at the European Organization for Nuclear Research (CERN). As a result of the propositions to improve the ionization efficiency, two FEBIAD prototypes have been produced and successfully tested in 2008. Off-line studies showed that the 1+ ionization efficiencies for noble gases are 5–20 times larger than with the standard ISOLDE FEBIAD ion sources and reach 60% for radon, which allowed the identification at ISOLDE of <sup>229</sup> R n , an isotope that had never previously been observed in the laboratory. A factor of 3 increase is also expected for the ionization efficiency of the other elements. The experimental and theoretical methodology is presented. The theoretical model, which gives precise insights on the processes affecting the ionization, is used to design optimal sources (grouped under the name of VADIS—Versatile Arc Discharge Ion Source) for the different chemical classes of the produced isotopes, as already demonstrated for the noble gases.
    Review of Scientific Instruments 03/2010; · 1.60 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Since 2006 the ISOLTRAP mass spectrometer has provided high-precision masses of many short-lived nuclides located all across the nuclear chart with half-lives down to a few 10 ms. These nuclides range from the two-proton halo candidate 17Ne, via the neutron-rich magic 80Zn and 132Sn, up to 229Rn which was identified for the first time. The results show that ISOLTRAP is a versatile tool well suited to address physics topics such as nuclear structure, stellar nucleosynthesis, or the weak interaction. KeywordsAtomic masses-Penning trap mass spectrometry-Magic numbers-Nucleosynthesis-CVC hypothesis and CKM unitarity
    Hyperfine Interactions 196(1):199-203. · 0.21 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The international workshop on “Application of Lasers and Storage Devices in Atomic Nuclei Research” held during 2009 in Poznan gave an excellent overview on the latest experimental and theoretical results regarding the investigation of radionuclides by atomic physics techniques and the extraction of ground state properties of exotic nuclei. This publication intends to summarize the progress recently achieved by laser spectroscopy and mass spectrometry as well as by weak interaction studies using atomic physics techniques. Furthermore, it tries to point to some areas requiring urgent improvements and to indicate some routes of future research and challenging opportunities. KeywordsAtomic physics techniques-Laser spectroscopy-Mass spectrometry-Weak interaction studies-Exotic nuclei-Cooling-Ion traps-Storage rings-Magneto-optical traps
    Hyperfine Interactions 196(1):295-337. · 0.21 Impact Factor

Full-text (2 Sources)

Available from
May 15, 2014