Using light charged particles to probe the asymmetry dependence of the nuclear caloric curve

作者：McIntosh A B^*; Bonasera A; Kohley Z; Cammarata P J; Hagel K; Heilborn L; Mabiala J; May L W; Marini P; Raphelt A; Souliotis G A; Wuenschel S; Zarrella A; Yennello S J

来源：Physical Review C, 2013, 87(3): 034617.

DOI：10.1103/PhysRevC.87.034617

Recently, we observed a clear dependence of the nuclear caloric curve on neutron-proton asymmetry N-Z/A 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.

• 出版日期2013-3-19