Observing the ping-pong modality of the isospin degree of freedom in cluster emission from heavy-ion reactions

Two-body correlations of the isotope-resolved light and heavy clusters are measured in $^{86}$Kr+$^{\rm 208}$Pb reactions at 25 MeV/u. The yield kinetic variables $A=3$ isobars, triton $^3$He, analyzed coincidence with $7\le A \le 14$ emitted earlier chance. While velocity spectra both $^3$He exhibit scaling behavior over type clusters, ratios ${\rm t/^3He}$ correlate reversely to neutron-to-proton ratio $N/Z$ latter, showing ping-pong modality clusters. commonality that residues keeps initial system value is extended cluster emission ion reactions. comparison transport model calculations data discussed.