Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 16: Nuclear Structure and Dynamics II
HK 16.2: Vortrag
Montag, 16. März 2009, 17:00–17:15, H-ZO 60
Hyperdeformed Fission Resonances observed in 232U* — •L. Csige1,3, M. Csatlos1, T. Faestermann2, Z. Gacsi1, J. Gulyas1, D. Habs3, R. Hertenberger3, M. Hunyadi1, A. Krasznahorkay1, R. Lutter3, H.-J. Maier3, P.G. Thirolf3, and H.-F. Wirth3 — 1Inst. of Nucl. Res. of the Hungarian Acad. of Sciences, Debrecen, Hungary — 2TU München, Physik Department E12, Garching, Germany — 3LMU München, Fakultät f. Physik, Garching, Germany
Hyperdeformed (HD) third minima are expected to appear in the potential energy surface of many actinide nuclei according to theoretical calculations. The existence of HD states was experimentally established earlier in the uranium isotopes 234,236U [1,2]. In a recent experiment the fission probability of 232U was measured as a function of the excitation energy using the 231Pa(3He,df) reaction at the Garching Q3D magnet spectrograph. Sub-barrier fission resonances have been observed for the first time in the excitation energy region E=4.5-4.8 MeV and interpreted as being rotational bands with rotational parameters characteristic to a HD nuclear shape (ℏ2/2Θ=1.9 keV). Fission barrier poarameters were extracted and angular distributions of the fission fragments were determined in order to deduce the K value of the rotational bands. According to our new results 232U can be a good candidate to search for discrete γ transitions of hyperdeformed states.
[1] A. Krasznahorkay et al., Phys. Rev. Lett. 80 (1998) 2073. [2] M. Csatlós et al., Phys. Lett. B615 (2005) 175.
*supported by DFG Cluster of Excellence UNIVERSE and by DFG under contract HA 1101/12-1