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Coulomb proximity decay: A clock for measuring the particle emission time scale

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arxiv nucl-ex/0308031 v2 pith:HS53HJ6G submitted 2003-08-28 nucl-ex

S. Hudan , A.S. Botvina , R. Alfaro , L. Beaulieu , B. Davin , Y. Larochelle , T. Lefort , V.E. Viola
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H. Xu R. Yanez R.T. de Souza T.X. Liu X.D. Liu W.G. Lynch R. Shomin W.P. Tan M.B. Tsang A. Vander Molen A. Wagner H.F. Xi R.J. Charity L.G. Sobotka
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A new method to examine the time scale of particle emission from hot nuclei is explored. Excited projectile-like and target-like fragments decay as they separate following a peripheral heavy-ion collision. Their mutual Coulomb influence results in an anisotropic angular distribution of emitted particles, providing a measure of the particle emission time scale. Predictions of a schematic evaporation model are presented and compared to experimental data.

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