Evidence for the predominant in uence of the asymmetry degree of freedom on the even-odd structure in fission-fragment yields

Abstract : Based on a wide systematics of ssion-fragment distributions measured in low-energy ssion, the even-odd staggering in the ssion-fragment element yields is investigated. The well-established evolution of the global even-odd eect with the ssioning system is found to be only a partial aspect of the even-odd structure. Indeed, it is shown that the global even-odd eect is varying systematically with the mean asymmetry of the ssion-fragment distribution, and that the general increase of the even-odd staggering with asymmetry is depending on the ssioning system. Thus, the dependency of the even-odd eect with the ssioning system is accredited in part to the asymmetry evolution of the charge distribution, and not solely related to the dissipated energy as it has been done earlier. This interpretation is strongly supported by data measured in inverse kinematics, which cover the complete charge distribution and include precise yields at symmetry. The relevance of the order parameter to describe the even-odd eect in ssion-fragment yields as a general property is explored.
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Submitted on : Tuesday, September 8, 2009 - 9:01:46 AM
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M. Caamano, F. Rejmund, K.-H. Schmidt. Evidence for the predominant in uence of the asymmetry degree of freedom on the even-odd structure in fission-fragment yields. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2011, 38, pp.035101. ⟨10.1088/0954-3899/38/3/035101⟩. ⟨in2p3-00414126⟩

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