Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 2: Nuclear Structure/Spectroscopy I

HK 2.2: Gruppenbericht

Montag, 8. März 2004, 16:15–16:45, A

New results from direct mass measurements at GSI — •Yu.A. Litvinov¹, H. Geissel^1,2, M. Matoš¹, Yu.N. Novikov³, Z. Patyk¹, T. Radon¹, C. Scheidenberger¹, F. Attallah¹, K. Beckert¹, P. Beller¹, F. Bosch¹, D. Boutin¹, T. Buervenich⁴, M. Falch⁵, T. Faestermann⁶, B. Franzke¹, M. Hausmann⁴, E. Kaza¹, T. Kerscher⁵, O. Klepper¹, H.-J. Kluge¹, C. Kozhuharov¹, K.-L. Kratz⁷, S.A. Litvinov¹, K.E.G. Löbner⁵, G. Münzenberg^1,7, L. Maier⁶, F. Nolden¹, T. Ohtsubo⁸, A. Ostrowski⁷, A. Ozawa⁹, B. Pfeiffer⁷, M. Portillo¹, J. Stadlmann¹, T. Suzuki⁸, M. Steck¹, S. Typel¹, D. Vieira⁴, H. Weick¹, M. Winkler¹, H. Wollnik², and T. Yamaguchi¹ — ¹GSI Darmstadt — ²JLU Giessen — ³PNPI St. Petersburg — ⁴LANL Los Alamos — ⁵LMU München — ⁶TU München — ⁷JGU Mainz — ⁸Niigata University — ⁹RIKEN Saitama

A report will be given on the progress in direct mass measurements with Isochronous (IMS) and Schottky (SMS) Mass Spectrometry at the FRS-ESR. The mass surface of rather long-lived (T_1/2≥1 s) neutron-deficient nuclides, consisting of about 450 nuclei from Kr to At, was measured with a precision of 30 keV by time-resolved SMS. Using known decay energies, masses of 140 nuclides could be determined in addition. 114 masses were obtained for the first time. New masses of about 40 short-lived uranium fission fragments were measured by IMS with a precision of about 250 keV. The measured data give the unique opportunity to check and to improve modern mass models, to locate the proton and two-proton drip-lines for heavy isotopes and moreover to perform investigations of the isospin dependence of nuclear pairing energies.