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Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 36: Postersitzung / Instrumentation und Anwendungen I

HK 36.8: Poster

Wednesday, March 24, 1999, 10:15–12:00, Foyer

Isochronous Mode of the ESR and Application to Mass-Measurements — •M. Hausmann1, F. Attallah1, K. Beckert1, F. Bosch1, A. Dolinskiy2, H. Eickhoff1, M. Falch3, B. Franczak1, B. Franzke1, H. Geissel1, Th. Horvath4, Th. Kerscher3, H.-J. Kluge1, C. Kozhuharov1, O. Klepper1, Yu. Litvinov5, K.E.G. Löbner3, G. Münzenberg1, F. Nolden1, Yu. Novikov5, T. Radon1, H. Schatz1, C. Scheidenberger1, J. Stadlmann4, M. Steck1, H. Weick1, M. Winkler1, Th. Winkler1, and H. Wollnik41GSI, Darmstadt — 2INR, Kiev — 3Sektion Physik, LMU, München — 4II. Physikalisches Institut, JLU, Giessen — 5PNPI, Gatchina, St. Petersburg

Direct mass measurements of exotic nuclei with lifetimes down to a few µs can be performed at the Experimental Storage Ring ESR at GSI by means of Isochronous Mass Spectrometry. For this purpose an isochronous ion-optical setting of the lattice has been developed and successfully tested at the ESR. It is characterized by a transition point as low as γt ≈ 1.37 (in comparison to 2.5 for the standard mode of operation) and therefore allows to inject and to store heavy ions fulfilling the isochronicity condition γ=γt. Hence the revolution frequency is a measure for their mass. Results of first experiments with projectile fragments produced from neon and nickel primary beams at the Fragment Separator FRS will be presented. A mass resolution of the order of mm=100.000 has been achieved. An outlook to future experiments will be given.

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