Dissipation effects in cluster fission.
The fission of Sr(2+)(n) is studied from time-of-flight (TOF) measurements. The TOF acts both as a mass spectrometer and as a velocity dispersion analyzer. Evidence of the postfission ejection of a fast neutral atom is shown. It is explained assuming a strong deformation of the fissioning system at the transition state. The relaxation of the deformation energy into vibrations promotes the evaporation of the large fragment.
Laboratoire Aimé Cotton CNRS II, Bâtiment 505, Université Paris-Sud, F-91405 Orsay CEDEX, France.
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Bréchignac
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Cahuzac
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Concina
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Leygnier