Abstract
Recently published data on mass and charge distributions in interactions of56Fe with209Bi are reexamined. Both the average mass-to-charge ratio and the relationship between the variances of the mass and charge distributions were found to depend on the degree of energy damping. This was reported to present evidence for long interaction times required for charge equilibration and for the evolution of correlations in the exchange of neutrons and protons. We show that the dependence of the equilibrated mass-to-charge ratios on energy loss is the combined result of i) the mass drift in the56Fe+209Bi reaction and ii) the steep gradients of the potential energy surface which lead to a strong dependence of the mass-to-charge ratios on mass asymmetry. Also, the ratios of the variances of mass and charge distributions are shown to reflect the varying slope of the potential energy valley. It is concluded that the56Fe+209Bi data are consistent with fast charge equilibration and fully correlated nucleon exchange in agreement with the behaviour of other systems.
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The authors are indebted to H. Freiesleben for his contribution to the potential energy calculations.
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Kratz, J.V., Brüchle, W., Gäggeler, H. et al. FastA/Z equilibration and correlated nucleon exchange in damped collisions of56Fe ions with209Bi. Z Physik A 296, 141–145 (1980). https://doi.org/10.1007/BF01412655
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DOI: https://doi.org/10.1007/BF01412655