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MS: Fachverband Massenspektrometrie
MS 4: Ion Storage Rings
MS 4.2: Vortrag
Dienstag, 18. März 2014, 14:30–14:45, DO24 1.205
A New Data Evaluation Approach for Mass Measurements of Exotic Nuclei performed with Isochronous Mass Spectrometry — •M. Diwisch1, R. Knöbel1,2, H. Geissel1,2, Z. Patyk3, W.R. Plaß1,2, C. Scheidenberger1,2, H. Weick2, K. Beckert2, F. Bosch2, D. Boutin1,2, C. Brandau1,2, L. Chen1,2, I.J. Cullen4, C. Dimopoulou2, A. Dolinskii2, B. Fabian1, M. Hausmann5, O. Klepper2, C. Kozhuharov2, J. Kurcewicz2, N. Kuzminchuk1, S.A. Litvinov2, Yu.A. Litvinov2, Z. Liu4, M. Mazzocco2, F. Montes5, G. Münzenberg2, A. Musumarra7, S. Nakajima8, C. Nociforo2, F. Nolden2, T. Ohtsubo9, A. Ozawa10, M. Steck2, B. Sun2,11, T. Suzuki8, P.M. Walker4, N. Winckler6, M. Winkler2, and T. Yamaguchi8 — 1Justus Liebig University Gießen — 2GSI, Darmstadt — 3Soltan Institute for Nuclear Studies, Warszawa, Poland — 4University of Surrey, Guildford, United Kingdom — 5Michigan State University, East Lansing, U.S.A. — 6Max Planck Institut für Kernphysik, Heidelberg — 7Laboratori Nazionali del Sud, INFN Catania, Italy — 8Saitama University, Saitama, Japan — 9Niigata University, Niigata, Japan — 10University of Tsukuba, Tsukuba, Japan — 11School of Physics, Peking University, Beijing, China
The Isochronous Mass Spectrometry (IMS) and Schottky Mass Spectrometry (SMS) are powerful tools to measure masses of rare exotic nuclei in a storage ring. While the SMS method provides very high accuracies it does not give access to rare isotopes with lifetimes in the sub second range because beam cooling has to be performed for a few seconds before the measurements start. As a complementary method IMS can be used without beam cooling to reach isotopes with lifetimes of only a few 10µs. As a drawback of the IMS method one cannot achieve the high mass accuracy of the SMS method until now.
For the data evaluation of the SMS data a correlation matrix method has been successfully applied in the past. In order to improve the accuracy of the IMS measurements the same method will now be used, which will allow to combine and to correlate data from different IMS measurements with each other. Applying this method to the analysis of previous experiments with uranium fission fragments at the FRS-ESR facility at GSI and to future experiments, will increase the accuracy of the IMS method and may lead to new mass values with reasonable accuracies for very rare and important nuclei for nuclear astrophysics such as 130Cd, which were not accessible before.