Abstract
Abstract It is shown that the recently proposed sorting of intrinsic excitation energy in fission dynamics under the influence of pairing correlations explains the complex features of even-odd structure in fission-fragment yields. A schematic dynamical scenario is proposed. It reveals that the variation of the even-odd effect with the Coulomb parameter of the compound nucleus and the increase towards asymmetric splits carries information on several dynamical times. This new insight stresses the importance of nuclear fission as a laboratory for studying the dynamics of non-equilibrium processes in mesoscopic objects under the influence of residual interactions.
Highlights
The most prominent manifestation of pairing correlations in nuclear fission is the enhanced production of even-Z elements in low-energy fission of an even-Z compound nucleus
This implies that excitation energy and unpaired nucleons are predominantly transferred to the heavy fragment
Our results indicate that the time for transfer of excitation energy and nucleons is shorter than the saddle-to-scission time
Summary
The most prominent manifestation of pairing correlations in nuclear fission is the enhanced production of even-Z elements in low-energy fission of an even-Z compound nucleus. The humps result from the shape of the potential as a function of mass (or charge) asymmetry as given by the liquid-drop with influence of shell effects. These data and the systematics compiled in [3] clearly illustrate several features:. We present a model for the even-odd effect that is based on statistical mechanics
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