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Search for extremely deformed fission fragment in $^{28}Si+^{28}Si$ with Eurogam Phase II
C. Beck1, R. Nouicer1, S.J. Sanders, A. Szanto de Toledo, Sl. Cavallaro

A high-resolution study of fragment-fragment-$\gamma$ triple coincident measurements of the symmetric-mass fission exit-channel from the ^{28}Si+^{28}Si reaction has been performed at the VIVITRON Tandem facility by using the EUROGAM Phase II $\gamma$-ray spectrometer. The bombarding energy E_{lab}(^{28}Si) = 111.6 MeV has been chosen to populate a well known quasi-molecular resonance in ^{56}Ni. Evidence is presented for a selective population of states in ^{28}Si fragments arising from the symmetric-fission of the ^{56}Ni compound nucleus. In the resonant region the enhanced population of the K^{\pi} = 3_{1}^{-} band of the ^{28}Si nucleus, indicative of an oblate deformed shape, appears to play a significant role in the collision processes. The resonant behavior in the elastic and inelatic ^{28}Si+^{28}Si exit-channels is found to be correlated to strong disalignment features of the di-nuclear oblate-oblate system with an equator-equator stable configuration.
1 :  IReS - Institut de Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale
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