Search for extremely deformed fission fragment in $^{28}Si+^{28}Si$ with Eurogam Phase II

Abstract : 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.
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Preprints, Working Papers, ...
IReS-97-22. 16 pages LaTeX, 9 Figures available upon request. 1997


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Contributor : Dominique Girod <>
Submitted on : Wednesday, July 26, 2006 - 2:00:35 PM
Last modification on : Wednesday, July 26, 2006 - 2:00:40 PM

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C. Beck, R. Nouicer, S.J. Sanders, A. Szanto De Toledo, Sl. Cavallaro. Search for extremely deformed fission fragment in $^{28}Si+^{28}Si$ with Eurogam Phase II. IReS-97-22. 16 pages LaTeX, 9 Figures available upon request. 1997. <in2p3-00087730>

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