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$^{8}$Be cluster emission versus alpha evaporation in $^{28}Si + $^{12}$C

Abstract : The possible occurence of highly deformed configurations in the $^{40}$Ca di-nuclear system formed in the $^{28}$Si + $^{12}$C reaction is investigated by analyzing the spectra of emitted light charged particles. Both inclusive and exclusive measurements of the heavy fragments (A $\geq$ 10) and their associated light charged particles (protons and $\alpha$ particles) have been made at the IReS Strasbourg {\sc VIVITRON} Tandem facility at bombarding energies of $E_{lab}$ ($^{28}$Si) = 112 MeV and 180 MeV by using the {\sc ICARE} charged particle multidetector array. The energy spectra, velocity distributions, in-plane and out-of-plane angular correlations of light charged particles are compared to statistical-model calculations using a consistent set of parameters with spin-dependent level densities. This spin dependence approach suggests the onset of large nuclear deformation in $^{40}$Ca at high spin. This conclusion might be connected with the recent observation of superdeformed bands in the $^{40}$Ca nucleus. The analysis of $\alpha$ particles in coincidence with $^{32}$S fragments suggests a surprisingly strong $^{8}$Be cluster emission of a binary nature.
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Contributor : Dominique Girod <>
Submitted on : Wednesday, July 26, 2006 - 2:32:23 PM
Last modification on : Thursday, April 23, 2020 - 2:26:21 PM

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Marc Rousseau, C. Beck, C. Bhattacharya, V. Rauch, O. Dorvaux, et al.. $^{8}$Be cluster emission versus alpha evaporation in $^{28}Si + $^{12}$C. 2002. ⟨in2p3-00087726⟩



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