Speaker: Zach Kohley, Texas A&M 
Title: "Transverse Collective Flow of Light Charged Particles and 
Intermediate Mass Fragments in the Fermi Energy Regime" 
Place: A234 conference room, Bldg 1, TA-53 
Time: 1 p.m., Tuesday, March 16  

Abstract:  The transverse flow of light charged particles (LCPs) and 
intermediate mass fragments (IMFs) have been investigated for the 35 
MeV/u 70Zn+70Zn, 64Zn+64Zn, and 64Ni+64Ni systems. The experimental 
data was collected using the 4¹ NIMROD-ISiS array, which provided both 
event characterization and excellent isotopic resolution of charged 
particles.  The transverse flow of proton, deuteron, triton, 3He, 
alpha, and 6He particles presented new isotopic and isobaric trends 
demonstrating a decreasing flow with increasing neutron richness of the 
fragments. The transverse flow of IMFs was examined providing a new 
probe to study the dynamics of the heavy-ion collisions. A transition 
from the IMF transverse flow strongly depending on the mass of the 
colliding system, in the most violent collisions, to a dependence on 
the charge of the system, for the peripheral reactions, was observed. 
Previous theoretical calculations suggested that fragment flows could 
be used to probe the nuclear equation of state. Current theoretical 
models were compared with the experimental results in order to show 
that the LCP and IMF transverse flows are sensitive to the nuclear 
equation of state, specifically the density dependence of the symmetry 
energy. The best agreement between the experiment and simulations was 
obtained with a stiff density dependence of the symmetry energy.