1301.6805 (Alan B. McIntosh et al.)

Using Light Charged Particles to Probe the Asymmetry Dependence of the
Nuclear Caloric Curve    [PDF]

Alan B. McIntosh, Aldo Bonasera, Zachary Kohley, Paul J. Cammarata, Kris Hagel, Lauren Heilborn, Justin Mabiala, Larry W. May, Paola Marini, Andrew Raphelt, George A. Souliotis, Sara Wuenschel, Andrew Zarrella, Sherry J. Yennello

Recently, we observed a clear dependence of the nuclear caloric curve on neutron-proton asymmetry $\frac{N-Z}{A}$ through examination of fully reconstructed equilibrated quasi-projectile 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 which is consistent with an average emission-time ordering.

View original: http://arxiv.org/abs/1301.6805