München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.24: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Investigations of mass resolving power in Isochronous Mass Spectrometry — •S. Litvinov1,2, H. Weick1, A. Dolinskii1, H. Geissel1,2, Y. Litvinov1,2, K. Beckert1, P. Beller 1, F. Bosch1, C. Botta 1, D. Boutin 1,2, L. Chen1,2, R. Knöbel1,2, C. Kozhuharov1, J. Kurcewicz1, M. Mazzocco1, A. Musumarra1, C. Nociforo1, F. Nolden1, W. Plaß2, C. Scheidenberger1,2, M. Steck1, B. Sun1,3, and M. Winkler1 — 1GSI, Darmstadt — 2JLU Giessen — 3Peking University
The FRS-ESR facilities at GSI provide a unique method for measuring masses of very short lived, exotic nuclides. For this the ESR is tuned to an isochronous mode which allows to measure mass-to-charge ratios as a function of revolution time independent of the ions’ velocities. The half-lives of exotic nuclides just have to be longer than a few ten µ s. The mass resolving power achieved so far was 100000. In order to improve it additional remaining effects on the time-of-flight (ToF) have to be considered. The velocity dependence for ions with different mass-to-charge ratio other than that of a fully isochronous ion was investigated in simulation and experiment by looking at the resolution and accuracy of nuclides with known masses with full and restricted acceptance in magnetic rigidity defined by the slit system of the FRS to about Δ Bρ/ Bρ=10−4. The results of the measurements and ion-optical simulation will be presented and compared. The outcome influences the method for future mass measurements in the planned collector ring (CR) of the FAIR project. Here two ToF detectors shall be applied to gain the full information on velocity and ToF.