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Calibrating the medium effects of light clusters in heavy-ion collisions
Authors: Custódio, T.; Rebillard-Soulié, A.; Bougault, R.; Gruyer, D.; Gulminelli, F.; Malik, T.; Pais, H.; Providência, C.
Ref.: Phys. Rev. Lett. 134 (8), 082304 (2025)
Abstract: We propose a Bayesian inference estimation of in-medium modification of the cluster self-energies from light nuclei multiplicities measured in selected samples of central 136;124Xe + 124;112Sn collisions with the INDRA apparatus. The data are interpreted with a relativistic quasiparticle cluster approach in the meanfield approximation without any prior assumption on the thermal parameters of the model. An excellent reproduction is obtained for H and He isotope multiplicities, and compatible posterior distributions are found for the unknown thermal parameters. We conclude that the cluster-sigma-meson coupling is temperature dependent, becoming weaker when the temperature increases, in agreement with microscopic quantum statistical calculations. This implies a faster decrease of the light cluster abundances with temperature than previously estimated.
