Using light charged particles to probe the asymmetry dependence of the nuclear caloric curve
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Recently, we observed a clear dependence of the nuclear caloric curve on neutron-proton asymmetry N-ZA through examination of fully reconstructed equilibrated quasiprojectile sources produced in heavy-ion collisions at E/A=35 MeV. In the present work, we extend our analysis using multiple light charged particle probes of the temperature. Temperatures are extracted with five distinct probes using a kinetic thermometer approach. Additionally, temperatures are extracted using two probes within a chemical thermometer approach (Albergo method). All seven measurements show a significant linear dependence of the source temperature on the source asymmetry. For the kinetic thermometer, the strength of the asymmetry dependence varies with the probe particle species in a way that is consistent with an average emission-time ordering. © 2013 American Physical Society.
author list (cited authors)
McIntosh, A. B., Bonasera, A., Kohley, Z., Cammarata, P. J., Hagel, K., Heilborn, L., ... Yennello, S. J.