Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Postersitzung

HK 36.21: Poster

Mittwoch, 17. März 2010, 14:00–16:00, HG Aula

Investigation of the triple-humped fission barrier of 233Th — •Lorant Csige1, Margit Csatlos3, Attila Krasznahorkay3, Peter Thirolf1, Thomas Faestermann2, Janos Gulyas3, Dieter Habs1, Ralf Hertenberger1, Rudi Lutter1, Tamas Tornyi3, and Hans-Friedrich Wirth21Ludwig Maximilians Universitat, Munich, Germany — 2Technische Universitat, Munich, Germany — 3Inst. of Nucl. Res. of the Hun. Acad. of Sci.

Previously, sharp fission resonances were observed by Blons and coworkes [1] and interpreted by them as the consequence of a theoretically predicted (hyperdeformed) third potential minimum. They suggested that the observed resonances appeared at those energies where the nucleus has excited states in the third minimum of the multiple-humped potential barrier.

Sharp resonance bands were observed for the first time in the fission probability of the 234U and 236U isotopes, supporting the existence of a deep third minimum of the potential barrier, in good agreement with theoretical predictions. In this theory also a deep third minimum is predicted for 232Th. However, even in the latest cross section calculations a very shallow one was successfully used in reproducing the prompt fission cross sections.

In order to get more insight into the fission barrier landscape of 232Th a new experiment has been performed at the Munich Tandem accelerator using the 232(d,pf) reaction, which excites higher spin states compared to the (n,f) reaction. [1] J. Blons et al., Phys. Rev. Lett. 35 (1975) 174

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