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

Thermodynamic and chemical two-body correlations of the isotope-resolved clusters are measured in 86Kr + 208Pb reactions at 25 MeV/u. The yield and kinetic variables of the A = 3 isobars are analyzed in coincidence with the intermediate mass fragments of 6 A 11. While the velocity spectra of both t and 3He exhibit scaling behavior over the type of the intermediate mass fragments, the yield ratios of t/ 3He correlate reversely to the neutron-to-proton ratio N/Z of the latter, showing the ping-pong modality of the N/Z of the emitted particles. The commonality that the N/Z of the residues keeps the initial system value is extended to the cluster emission in heavy ion reactions. The comparison to transport model calculations to the data is discussed.

Automated summary

Thermodynamic and chemical two-body correlations of isotope-resolved clusters were measured in 86Kr + 208Pb reactions at 25 MeV/u. Analysis of the yield and kinetic variables of A = 3 isobars were done in coincidence with intermediate mass fragments of 6 A 11. The yield ratios of t/3He correlated reversely with the neutron-to-proton ratio N/Z of the intermediate mass fragments, showing the ping-pong modality of the emitted particles' N/Z. The comparison to transport model calculations was discussed.