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Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium

Chen, L, Plaß, WR, Geissel, H, Knöbel, R, Kozhuharov, C, Litvinov, YA, 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, Ugorowski, P, Walker, PM, Williams, S, Winkler, M, Wollersheim, H-J and Yamaguchi, T (2010) Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 691 (6). 234 - 237. ISSN 0370-2693

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Abstract

238U projectile fragments have been created at the entrance of the fragment separator FRS, spatially separated in flight within 0.45 μs and injected into the storage-cooler ring ESR at 7.9 Tm corresponding to about 70% light velocity. Accurate new mass values and lifetime information of the stored exotic nuclei in the element range from platinum to uranium have been obtained with single-particle Schottky spectrometry. In this experiment the new isotopes of 236Ac, 224At, 221Po, 222Po, and 213Tl were discovered. The isotopes were unambiguously identified and their masses measured. In addition, the time-correlated data have provided information on the lifetime of the new nuclides. The discovery of isotopes along with accurate mass measurement has been achieved for the first time at the FRS-ESR facility. The results will contribute to the knowledge of the decay products from the r-process nuclei and enable a crucial test of the predictive power of modern nuclear mass and half-life models.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 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 Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 691(5), June 2010, DOI 10.1016/j.physletb.2010.05.078.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 02 Feb 2012 16:46
Last Modified: 23 Sep 2013 18:48
URI: http://epubs.surrey.ac.uk/id/eprint/7511

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