Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 806 - 812
Section Nuclear physics
Published online 10 May 2006
Europhys. Lett., 74 (5), pp. 806-812 (2006)
DOI: 10.1209/epl/i2006-10040-x

Cooling dynamics in multi-fragmentation processes

T. X. Liu1, W. G. Lynch1, M. J. van Goethem1, X. D. Liu1, R. Shomin1, W. P. Tan1, M. B. Tsang1, G. Verde1, A. Wagner1, H. F. Xi1, H. S. Xu1, W. A. Friedman2, S. R. Souza3, R. Donangelo3, L. Beaulieu4, B. Davin4, Y. Larochelle4, T. Lefort4, R. T. de Souza4, R. Yanez4, V. E. Viola4, R. J. Charity5 and L. G. Sobotka5

1  National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University - East Lansing, MI 48824, USA
2  Department of Physics, University of Wisconsin - Madison, WI 53706, USA
3  Instituto de Fisica, Universidade Federal do Rio de Janeiro Cidade Universitária, CP 68528, 21941-972 Rio de Janeiro, Brazil
4  Department of Chemistry and IUCF, Indiana University Bloomington, IN 47405, USA
5  Department of Chemistry, Washington University St. Louis, MO 63130, USA

received 16 February 2006; accepted in final form 10 April 2006
published online 10 May 2006

Fragment energy spectra of neutron-deficient isotopes are significantly more energetic than those of neutron-rich isotopes of the same element. This trend is well beyond what can be expected for the bulk multi-fragmentation of an equilibrated system. It can be explained, however, if some of these fragments are emitted earlier through the surface of the system while it is expanding and cooling.

24.10.Pa - Thermal and statistical models.
25.70.Pq - Multifragment emission and correlations.

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