Manifestation of transient effects in fission induced by relativistic heavy-ion collisions
arXiv:nucl-ex/0403004 · doi:10.1016/j.nuclphysa.2005.04.020
Abstract
We examine the manifestation of transient effects in fission by analysing experimental data where fission is induced by peripheral heavy-ion collisions at relativistic energies. Available total nuclear fission cross sections of 238U at 1 A GeV on gold and uranium targets are compared with a nuclear-reaction code, where transient effects in fission are modelled using different approximations to the numerical time-dependent fission-decay width: a new analytical description based on the solution of the Fokker-Planck equation and two widely used but less realistic descriptions, a step function and an exponential-like function. The experimental data are only reproduced when transient effects are considered. The deduced value of the dissipation strength depends strongly on the approximation applied for the time-dependent fission-decay width and is estimated to be of the order of 2x10**21 s**(-1). A careful analysis sheds severe doubts on the use of the exponential-like in-growth function largely used in the past. Finally, we discuss which should be the characteristics of experimental observables to be most sensitive to transient effects in fission
arXiv comment18 pages, 2 figures, background information on http://www-w2k.gsi.de/kschmidt/
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Cited by in corpus (5)
- Extension of the Liège Intranuclear-Cascade model to reactions induced by light nuclei
- First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams
- Fragmentation of spherical radioactive heavy nuclei as a novel probe of transient effects in fission
- A critical analysis of the modelling of dissipation in fission
- Transient and quasi-stationary dissipative effects in the fission flux across the barrier in 1 A GeV 238U on deuterium reactions