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HK: Physik der Hadronen und Kerne

HK 2: Kernphysik/Spektroskopie I

HK 2.10: Vortrag

Montag, 17. März 2003, 18:30–18:45, A

Investigation of fold distributions and deduction of fission barriers — •A.A. Pasternak^1,2, R.M. Lieder¹, E.O. Podsvirova^1,2, W. Gast¹, D. Bazzacco³, G. de Angelis⁴, and J. Dudek⁵ — ¹IKP, FZ Jülich, D-52425 Jülich — ²A.F. Joffe PTI, RU-194021 St. Petersburg — ³INFN, Sezione di Padova, I-35131 Padova — ⁴INFN, LNL, I-35020 Legnaro — ⁵IReS, F-67037 Strasbourg, France

In order to extract information about fission barriers experimental fold distributions have been compared with calculated ones. Experimental fold distributions have been obtained for ^142−146Gd in the ¹¹⁴Cd(³⁶S,xn) (E=182 MeV), ⁹⁷Mo(⁵¹V,pxn) (E=238 MeV) and ¹⁰⁰Mo(⁴⁸Ti,xn) (E=215 MeV) reactions measured with GASP. Calculations of fold distributions start from the evaluation of the cross section as function of angular momentum for the compound nuclei taking into account the competition between fission and particle evaporation. The result of the simulation of the particle emission is the entry state distribution for each reaction channel. Subsequently, the γ decay of the entry states is simulated taking into account various decay modes such as deexcitation through stretched E2 bands (taking into account rotational damping), superdeformed bands, statistical E1, M1 and E2 transitions and magnetic rotational bands. The resulting γ-ray multiplicity distributions are folded by the experimental response function to obtain the fold distributions. The fold distributions are very sensitive to the fission barriers used in the calculations. The use of the fission barriers calculated in the model of Dudek and Pomorski allows to reproduce the experimental fold distributions very well.

The work was partly supported by the WTZ contract RUS 99/191.