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HK: Physik der Hadronen und Kerne

HK 41: Physik mit schweren Ionen IV

HK 41.1: Gruppenbericht

Donnerstag, 20. März 2003, 13:30–14:00, E

Mass measurements of exotic nuclei at FRS-ESR — •Yu.A. Litvinov^1,2, F. Attallah¹, K. Beckert¹, P. Beller¹, F. Bosch¹, D. Boutin¹, M. Falch³, T. Faestermann⁴, B. Franczak¹, B. Franzke¹, H. Geissel^1,2, M. Hausmann^1,5, M. Hellström¹, E. Kaza¹, T. Kerscher³, O. Klepper¹, H.-J. Kluge¹, C. Kozhuharov¹, K.-L. Kratz⁶, K.E.G. Löbner³, M. Matoš¹, G. Münzenberg^1,6, L. Maier⁴, F. Nolden¹, Yu.N Novikov¹, T. Ohtsubo⁷, A. Ostrowski⁶, A. Ozawa⁷, Z. Patyk¹, B. Pfeiffer⁶, W. Quint¹, T. Radon¹, H. Schatz¹, C. Scheidenberger¹, J. Stadlmann¹, K. Sümmerer¹, T. Suzuki⁷, M. Steck¹, D. Viera⁵, H. Weick¹, M. Winkler¹, H. Wollnik², and T. Yamaguchi¹ — ¹GSI Darmstadt — ²JLU Giessen — ³LMU München — ⁴TU München — ⁵LANL Los Alamos — ⁶JGU Mainz — ⁷Riken Saitama

Two complementary methods for mass-measurements of large areas on the mass-surface were developed at GSI. With time-resolved Schottky Mass Spectrometry (SMS) all nuclei with half-lives longer than a few seconds can be accessed whereas the lower half-life limit for the Isochronous Mass Spectrometry (IMS) is of the order of a few ten microseconds. Mass-resolving powers of 7·10⁵ and 1·10⁵ are achieved for SMS and IMS, respectively, which allow high-precision mass determination and the resolution of low-lying isomeric states. With these two methods masses of more than 300 exotic nuclides could be determined for the first time. Based on these measurements new physical conclusions for the one-proton drip-line (Re to Pa) and the validity of modern mass models will be presented.