Thermal quenching of electronic shells and channel competition in cluster fission
Constantine Yannouleas, Uzi Landman, C. Brechignac, Ph. Cahuzac, B. Concina, J. Leygnier
Abstract
Experimental and theoretical studies of fission of doubly-charged Li, Na, and K clusters in the low fissility regime reveal the strong influence of electronic shell effects on the fission products. The electronic entropy controls the quenching of the shell effects and the competition between magic-fragment channels, leading to a transition from favored channels of higher mass symmetry to the asymmetric channel involving the trimer cation at elevated temperatures.
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