Source size scaling of fragment production in projectile breakup
L. Beaulieu, D. R. Bowman, D. Fox, S. Das Gupta, J. Pan, G. C. Ball, B. Djerroud, D. Dore, A. Galindo-Uribarri, D. Guinet, E. Hagberg, D. Horn, R. Laforest, Y. Larochelle, P. Lautesse, M. Samri, R. Roy, C. St-Pierre
Abstract
Fragment production has been studied as a function of the source mass and excitation energy in peripheral collisions of 35Cl+197Au at 43 MeV/nucleon and 70Ge+natTi at 35 MeV/nucleon. The results are compared to the Au+Au data at 600 MeV/nucleon obtained by the ALADIN collaboration. A mass scaling, by Asource 35 to 190, strongly correlated to excitation energy per nucleon, is presented, suggesting a thermal fragment production mechanism. Comparisons to a standard sequential decay model and the lattice-gas model are made. Fragment emission from a hot, rotating source is unable to reproduce the experimental source size scaling.
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