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Pre-scission particle; gamma-ray emission; heavy-ion-induced fission; nuclear dynamics; dissipation; equilibrium transition-state model

An introduction is given to the physics of the equilibrium transition-state model and of dissipative nuclear dynamics. Experimental data on pre-scission particle and gamma-ray emission and their interpretation are reviewed. They appear to indicate overdamped motion of the nuclear fluid. A time scale for compound-nucleus fission of about 30 × 10⁻²¹ s or greater is indicated, whilst that for quasi- or fast-fission is somewhat shorter.

J O Newton¹

1. Department of Nuclear Physics, Research School of Physical Sciences, Australian National University, GPO Box 4, Canberra, A.C.T., Australia

Published

July 1989