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Scission configurations and their implication in fission-fragment angular momenta

Abstract : The generation of sizable angular momenta in fragments formed in low-energy nuclear fission is described microscopically within the general quantum-mechanical framework of orientation pumping due to the Heisenberg uncertainty principle. Within this framework, we make use of the results of Skyrme-Hartree-Fock plus BCSpairing calculations of fragment deformabilities to deduce a distribution of fission-fragment spins as a function of the fragment total excitation energy.We consider a fragmentation corresponding to a pair of deformed fragments and for which fission data are available. The properties of the scission configurations determine to a large extent the fission-fragment spins. This is why we pay particular attention to quantitatively defining the scission configurations and to studying the various implications of such a specific choice. A fair qualitative agreement with data is demonstrated and discussed within the limits of the simple scission-configuration model used here.
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Submitted on : Thursday, July 3, 2008 - 12:07:29 PM
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L. Bonneau, P. Quentin, I.N. Mikhailov. Scission configurations and their implication in fission-fragment angular momenta. Physical Review C, American Physical Society, 2007, 75, pp.064313. ⟨10.1103/PhysRevC.75.064313⟩. ⟨in2p3-00292983⟩



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