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

Autor: A. Kishada, L. Caceres, G. Münzenberg, Zygmunt Patyk, H. J. Wollersheim, L. Chen, G. A. Jones, J. Kurcewicz, P. Beller, Yu. A. Litvinov, B. Franzke, S. V. Rigby, C. Scheidenberger, I. J. Cullen, Fernando Montes, Norio Saito, Zhi Liu, M. Winkler, F. Nolden, Sergey Litvinov, Tomoki Saito, Bao-Hua Sun, C. Kozhuharov, Helmut Weick, Wolfgang R. Plaß, K. Beckert, M. Shindo, K. Siegień-Iwaniuk, Zs. Podolyák, F. Bosch, R. Knöbel, D. Boutin, Philip M Walker, S.K. Mandal, James Carroll, Takashi Ohtsubo, M. Górska, J. Gerl, Hans Geissel, M. Steck, R. Propri, Takayuki Yamaguchi, Philip B. Ugorowski, D. M. Cullen, S. J. Williams
Rok vydání: 2010
Předmět:
Zdroj: Physics Letters B. 691:234-237
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2010.05.078
Popis: 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.
Databáze: OpenAIRE
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