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New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at 360-400MeV/u

Chen, L, Plaß, WR, Geissel, H, Knöbel, R, Kozhuharov, C, Litvinov, Y, Patyk, Z, Scheidenberger, C, Siegień-Iwaniuk, K, Sun, B, Weick, H, Beckert, K, Beller, P, Bosch, F, Boutin, D, Caceres, L, Carroll, JJ, Cullen, DM, Cullen, IJ, Franzke, B, Gerl, J, Górska, M, Jones, GA, Kishada, A, Kurcewicz, J, Litvinov, SA, Liu, Z, Mandal, S, Montes, F, Münzenberg, G, Nolden, F, Ohtsubo, T, Podolyák, Z, Propri, R, Rigby, S, Saito, N, Saito, T, Shindo, M, Steck, M, Walker, PM, Williams, S, Winkler, M, Wollersheim, H-J and Yamaguchi, T (2012) New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at 360-400MeV/u Nuclear Physics A, 882. 71 - 89. ISSN 0375-9474

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Abstract

Masses of 238U projectile fragments have been measured with time-resolved Schottky Mass Spectrometry (SMS) at the FRS-ESR facility at GSI. The exotic nuclei were created in the production target at the entrance of the fragment separator FRS, spatially separated in flight and injected into the storage-cooler ring ESR at about 70% light velocity. This means the ions were mainly bare or carried only a few electrons, e.g., the population of Li-like ions was below 1% for Pt fragments. Accurate newmass values of 33 neutron-rich, stored exotic nuclei in the element range from platinum to uranium have been obtained for the first time. In total more than 150 nuclides including references with well-known masses have been covered in this large-area SMS measurement. A novel data analysis has been applied which reduces the systematic errors by taking into account the velocity profile of the cooler electrons and the residual ion-optical dispersion in this part of the storage ring. The experiment, the data analysis, and the mass values are presented. The experimental data are compared with theoretical predictions demonstrating systematic deviations of up to 1500 keV from modern mass models.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Nuclear Physics A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nuclear Physics A, 882, May 2012, DOI 10.1016/j.nuclphysa.2012.03.002.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 14 Jun 2012 12:31
Last Modified: 23 Sep 2013 19:23
URI: http://epubs.surrey.ac.uk/id/eprint/492261

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