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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. Wollnik⁴ — ¹GSI, 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 γ_t ≈ 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=γ_t. 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 m/Δ m=100.000 has been achieved. An outlook to future experiments will be given.