Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 64: Radii, Masses, Heavy Nuclei

HK 64.3: Group Report

Thursday, March 19, 1998, 14:45–15:15, E

New mass- and lifetime measurements of relativistic projectile fragments at GSI — •C. Scheidenberger¹, F. Attallah¹, K. Beckert¹, T. Beha², F. Bosch¹, H. Eickhoff¹, M. Falch², B. Franzke¹, Y. Fujita¹, H. Geissel¹, M. Hausmann¹, M. Hellström¹, Th. Kerscher², O. Klepper¹, H.-J. Kluge¹, C. Kozhuharov¹, K. E. G. Löbner², G. Münzenberg¹, F. Nolden¹, Yu. Novikov¹, Z. Patyk¹, W. Quint¹, T. Radon¹, H. Reich¹, B. Schlitt¹, M. Steck¹, K. Sümmerer¹, L. Vermeeren¹, M. Winkler¹, T. Winkler¹, and H. Wollnik³ — ¹Gesellschaft für Schwerionenforschung (GSI) Darmstadt — ²Ludwig-Maximilians-Universität München — ³Justus-Liebig-Universität Gießen

Beams of exotic nuclei far off stability can be produced at the GSI fragment separator FRS and stored and cooled in the storage-cooler ring ESR. In recent experiments carried out with fragments from Ni and Bi primary beams masses and lifetimes of proton- and neutron-rich isotopes have been measured using new experimental techniques. Improved cooling leads to a mass resolution m/ Δ m ≃ 6 · 10⁵ which allows to resolve low-lying isomers. More than 150 new mass values were obtained. Time-differential recording of the Schottky noise with a sampling rate of 600 kS per second allows for lifetime measurements of unstable nuclei. For the first time projectile fragments could be stored in the ESR operated in the isochronous mode. This mode allows for accurate mass measurements of short-lived nuclei with half-lifes down to the ms-range.