Binary reaction decays from Mg24+C12

Beck C. ; Papka P. ; Zafra A.S.I. ; Thummerer S. ; Azaiez F. ; Bednarczyk P. ; Courtin S. ; Curien D. ; Dorvaux O. ; Lebhertz D. ; Nourreddine A. ; Rousseau M. ; Vol Oertzen W. ; Gebauer B. ; Wheldon C. ; Kokalova Tz. ; De Angelis G. ; Gadea A. ; Lenzi S. ; Szilner S. ; Napoli D.R. ; Catford W.N. ; Jenkins D.G. ; Royer G. (2009)


Charged-particle and γ decays in Mg24* are investigated for excitation energies where quasimolecular resonances appear in C12+C12 collisions. Various theoretical predictions for the occurrence of superdeformed and hyperdeformed bands associated with resonance structures with low spin are discussed within the measured Mg24* excitation energy region. The inverse kinematics reaction Mg24+C12 is studied at Elab(Mg24)=130 MeV, an energy that enables the population of Mg24 states decaying into C12+C12 resonant breakup states. Exclusive data were collected with the Binary Reaction Spectrometer in coincidence with Euroball IV installed at the Vivitron tandem facility at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions, and their associated γ decays studied. Coincident events associated with inelastic and α-transfer channels have been selected by choosing the excitation energy or the entry point via the two-body Q values. The analysis of the binary reaction channels is presented with a particular emphasis on Mg24-γ, Ne20-γ, and O16-γ coincidences. New information (spin and branching ratios) is deduced on high-energy states in Mg24 and O16, respectively. © 2009 The American Physical Society.

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