a New Parameter for the Separation of Binary Reaction Mechanisms in Heavy-Ion Collisions

A method for studying the partition of excitation energy between binary fission-like reaction products from the mass-asymmetry distributions is proposed. It is based on the deviation of the fragment mass-asymmetry as registered by detectors from that formed at the scission point, which is caused by the emission of post-scission light particles. The excitation energy sharing parameter ζ for the event-by-event comparison of the temperatures of the fragments is introduced. This parameterization appears to be a useful tool for an advanced analysis of data from heavy-ion induced reactions. Its consistency is demonstrated with experimental data obtained for the reactions ¹⁴N (53 AMeV)+¹⁹⁷Au and ¹⁴N (53 AMeV)+²³²Th.