Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Struktur und Dynamik von Kernen
HK 59.6: Vortrag
Freitag, 23. März 2012, 12:30–12:45, P 4
Towards Photofission Studies with highly-brilliant γ beams — •Lorant Csige1, Dieter Habs1, Attila Krasznahorkay2, Janos Gulyas2, Peter G. Thirolf1, and Tamas G. Tornyi2 — 1Ludwig Maximilians Universität München, Garching, Germany — 2Inst. Nucl. Res. of Hung. Acad. Scienc. (ATOMKI), Debrecen, Hungary
Using highly brilliant γ beams, which will be soon available at the MEGa-Ray facility (Livermore) and at ELI-NP (Bucharest), a new experimental campaign on photofission studies can be envisaged to study extremely deformed nuclear states of the light actinides and their multiple-humped potential energy surface in a highly-selective way. The experimental technique of these studies is based on the observation of transmission resonances in the prompt fission cross section; the fission decay channel can be expressed as a tunneling process of gateway states in the 2nd and 3rd minimum through the multiple-humped fission barrier. Until now all photofission measurements at sub-barrier energies have been performed with bremsstrahlung photons, where the fission cross-section was folded by the increasing gamma-ray spectrum. Compared to the presently available gamma bandwidth of 100 keV, the soon available improved energy resolution of 1 keV will allow resolving the "isomeric shelf" in the photofission cross-section into underlying predicted individual resonances. Moreover, as a result of the strong spin selectivity of the photo-induced reactions, the states in the 2nd and 3rd minimum can be populated with much larger intensities compared to former methods (light-ion induced reactions), hence a detailed gamma-spectroscopy in these minima will be enabled.