Resonant recombination at ion storage rings: a conceptual alternative for isotope shift and hyperfine studies

C. Brandau, C. Kozhuharov, A. Mueller, D. Bernhardt, F. Bosch, D. Boutin, F. J. Currell, C. Dimopoulou, B. Franzke, S. Fritzsche, A. Gumberidze, Z. Harman, U. D. Jentschura, C. H. Keitel, Y. S. Kozhedub, R. Kruecken, Yu. A. Litvinov, F. Nolden, B. O'Rourke, R. ReuschlS. Schippers, V. M. Shabaev, U. Spillmann, Z. Stachura, M. Steck, Th. Stoehlker, I. I. Tupitsyn, D. F. A. Winters, A. Wolf

Research output: Contribution to journalArticlepeer-review


Sharp resonant structures in the cross section of the atomic electron-ion collision process of dielectronic recombination are exploited to study isotope shifts and hyperfine interaction of heavy highly-charged ions. This novel approach provides a conceptual alternative to existing methods. In this contribution, we present a series of measurements, which we performed at the heavy ion storage ring ESR of the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. In a first experiment the stable isotopes A = 142 and A = 150 of three-electron neodymium ANd57 +  were studied. Isotope shifts of dielectronic resonances associated with 2s − 2p j (j = 1/2, 3/2) transitions were extracted from the measured data. The evaluation of the energy shift was performed within a full QED framework and yielded a change in the mean-square charge radius of 142,150δ⟨r2⟩=−1.36(1)(3) fm2. At GSI, in addition to the investigation of stable isotopes unstable species can be artificially synthesized and studied. Radioisotopes produced in-flight from fragmentation of a 238U primary beam were injected into the ESR and were subsequently separated by their mass-to-charge ratio. This enabled us to perform first DR experiments with the exotic nuclei 237U89 +  (Z = 92 )and 234Pa88 +  (Z = 91).
Original languageEnglish
Pages (from-to)115-127
Number of pages13
JournalHyperfine Interactions
Issue number1-3
Publication statusPublished - Feb 2010


  • Dielectronic recombination
  • Isotope shift
  • Hyperfine interaction
  • Storage ring

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute


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