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Hyperfine Interactions

, Volume 173, Issue 1–3, pp 49–54 | Cite as

A new experimental approach for isochronous mass measurements of short-lived exotic nuclei with the FRS-ESR facility

  • H. Geissel
  • R. Knöbel
  • Yu. A. Litvinov
  • B. Sun
  • K. Beckert
  • P. Beller
  • F. Bosch
  • D. Boutin
  • C. Brandau
  • L. Chen
  • B. Fabian
  • M. Hausmann
  • C. Kozhuharov
  • J. Kurcewicz
  • S. A. Litvinov
  • M. Mazzocco
  • F. Montes
  • G. Münzenberg
  • A. Musumarra
  • C. Nociforo
  • F. Nolden
  • W. R. Plaß
  • C. Scheidenberger
  • M. Steck
  • H. Weick
  • M. Winkler
Article

Abstract

Projectile fragments separated in flight with the FRS have been injected into the storage ring ESR. Operating the ESR in the isochronous mode has enabled high-resolution mass measurements of short-lived isotopes. Already in our pilot experiments the Isochronous Mass Spectrometry (IMS) has provided accurate results for a restricted isotope range in the neighborhood of a selected isotope characterized by the best isochronous condition. In the present experiment this restriction has been overcome by precise external magnetic rigidity determination (1.5·10–4) at the dispersive midplane of the FRS. In this way the mass resolving power for neutron-rich fission fragments covering a large mass-over-charge ratio in one spectrum has been improved by up to one order of magnitude and the accuracy by more than a factor of two.

Keywords

Masses Stored fragments Isochronous mode 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • H. Geissel
    • 1
    • 2
  • R. Knöbel
    • 1
    • 2
  • Yu. A. Litvinov
    • 1
    • 2
  • B. Sun
    • 1
    • 3
  • K. Beckert
    • 1
  • P. Beller
    • 1
  • F. Bosch
    • 1
  • D. Boutin
    • 2
  • C. Brandau
    • 1
  • L. Chen
    • 2
  • B. Fabian
    • 2
  • M. Hausmann
    • 4
  • C. Kozhuharov
    • 1
  • J. Kurcewicz
    • 1
  • S. A. Litvinov
    • 1
    • 2
  • M. Mazzocco
    • 1
  • F. Montes
    • 1
  • G. Münzenberg
    • 1
  • A. Musumarra
    • 5
  • C. Nociforo
    • 1
  • F. Nolden
    • 1
  • W. R. Plaß
    • 2
  • C. Scheidenberger
    • 1
    • 2
  • M. Steck
    • 1
  • H. Weick
    • 1
  • M. Winkler
    • 1
  1. 1.Gesellschaft für Schwerionenforschung GSIDarmstadtGermany
  2. 2.Justus-Liebig Universität GießenGießenGermany
  3. 3.School of PhysicsPeking UniversityBeijingChina
  4. 4.Michigan State University, NSCLEast LansingUSA
  5. 5.LNS-INFN Catania62 CataniaItaly

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