Spin-Alignment and Quasi-Molecular Resonances in Heavy-Ion Collision

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dc.creatorNouicer, R.
dc.creatorBeck, C.
dc.creatorSanders, S. J.
dc.creatorde Toledo, A. Szanto
dc.creatorCavallaro, Sl.
dc.creatorUegaki, E.
dc.creatorAbe, Y.
dc.date1998-03-10
dc.date.accessioned2026-07-07T06:30:49Z
dc.date.available2026-07-07T06:30:49Z
dc.descriptionFragment-fragment-$γ$ triple coincidence measurements of the $^{28}$Si~$+$~$^{28}$Si reaction at E$_{\rm c.m.}$~=~55.8 MeV, carefully chosen to populate a well known quasi-molecular resonance in $^{56}$Ni, have been performed at the VIVITRON tandem facility by using the Eurogam Phase~II $γ$-ray spectrometer. In the $^{28}$Si~$+$~$^{28}$Si reaction, the resonant behavior of the $^{28}$Si $+$ $^{28}$Si exit-channel is clearly observed by the present fragment-fragment coincidence data. The more unexpected result is the spin disalignment of the $^{28}$Si $+$ $^{28}$Si resonance. This has been demonstrated first by the measured angular distributions of the elastic 0$^{+}$, inelastic 2$^{+}$ and mutual excitation channels 2$^{+}-2^{+}$, which are dominated by a unique and pure partial wave with L = 38 ${\rm \hbar}$, and has been confirmed by measuring their particle-$γ$ angular correlations with Eurogam Phase II. The spin disalignment supports new molecular model predictions, in which the observed resonance would correspond to the ''Butterfly mode''. A discussion concerning the {\it spin alignment and spin disalignment} for different systems : $^{12}$C~$+$~$^{12}$C, $^{24}$Mg~$+$~$^{24}$Mg and $^{28}$Si~$+$~$^{28}$Si will be given.}
dc.description15 pages standard LaTeX file, 12 Figures available upon request in Postscript files or faxed -- Talk presented at the XXXV! International Winter Meeting on Nuclear Physics, January 26-31, 1998, Bormio, Italy (Proceedings to be published in Ricerca Scientifica ed Educazione Permanente, edited by I. Iori) --
dc.identifierhttps://arxiv.org/abs/nucl-ex/9803005
dc.identifierhttp://arxiv.org/abs/nucl-ex/9803005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98439
dc.subjectNuclear Experiment
dc.titleSpin-Alignment and Quasi-Molecular Resonances in Heavy-Ion Collision
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