Göttingen 1997 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 18: Kernspaltung, Kernreaktionen I

HK 18.1: Vortrag

Montag, 24. März 1997, 17:00–17:15, HS K

Neutron induced fission of ²³⁸U — •F.-J. Hambsch¹, F. Vivès¹, S. Oberstedt², and G. Barreau³ — ¹JRC-IRMM, Retieseweg, B-2440 Geel, Belgium — ²ILL, F-38042 Grenoble, France — ³CENBG, F-2440 Bordeaux, France

At IRMM, the reaction ²³⁸U(n,f) has been studied. Mass-, kinetic energy- and angular distributions for both fission fragments have been measured at several incident neutron energies with a double ionization chamber with more than 10⁵ events. The pre-neutron fragment properties have been calculated taking into account the average number of neutrons released as a function of mass ν (A) deduced from the known ones of ²³³U and ²³⁵U. Above the barrier, the TKE shows a smooth behaviour with an apparent drop at the highest value of E_n, similar to the one observed in the reaction ²³⁷Np(n,f). In the region of the threshold, the behaviour of TKE  has been compared with the results of Goverdovsky et al. (1). In parallel theoretical calculations have been performed (2) in the frame of the multi-modal random neck-rupture model of Brosa et al. (3) and compared to the experimental results.

[1] A.A. Goverdovsky, B.D. Kuz’minov, and A.I. Sergachev, Sov. J. Nucl. Phys. 48, 5 (1988).

[2] S. Oberstedt, F.-J. Hambsch and F. Vivès, Proc. Int. Symp. Large-Scale Collective Motion of Atomic Nuclei, Brolo, Italy, 15-19.10.1996.

[3] U. Brosa, S. Großmann and A. Müller; Physics Reports 197 (1990) 167