München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.25: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Progress in isochronous mass measurements at the FRS-ESR facilities — •R. Knöbel1,2, B. Sun1,3, K. Beckert1, P. Beller1, F. Bosch1, C. Botta1, D. Boutin1,2, L. Chen1,2, H. Geissel1,2, C. Kozhuharov1, J. Kurcewicz1, S. Litvinov1,2, Yu.A. Litvinov1,2, M. Mazzocco1, A. Musumarra1, C. Nociforo1, F. Nolden1, W. Plaß2, C. Scheidenberger1,2, M. Steck1, H. Weick1, and M. Winkler1 — 1GSI, Darmstadt — 2JLU Giessen — 3Peking University
Accurate experiments on nuclear masses shed light on the basic nuclear properties such as the limits of their existence, the shell structure, the shapes and pairing correlations. Mass measurements of exotic nuclides require very fast and sensitive methods since the nuclides of interest are short-lived and have very small production cross-sections. The isochronous mass spectrometry is one of such experimental methods, which was developed at the FRS-ESR facilities at GSI. In the recent experiment the mass resolving power could be significantly improved by using the high resolving power of the FRS to derive precisely (roughly to 3· 10−4) the magnet rigidity of injected fragments. In this contribution we present preliminary results of measured masses of neutron-rich 238U fission fragments.