Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-12-13
Nucl.Phys. A673 (2000) 375-410
Physics
Nuclear Physics
Nuclear Theory
44 pages, 17 figures, mostly minor editorial corrections, Nucl. Phys. A in press
Scientific paper
10.1016/S0375-9474(00)00083-X
Midrapidity nucleon elliptic flow is studied within the Boltzmann-equation simulations of symmetric heavy-ion collisions. The simulations follow a lattice Hamiltonian extended to relativistic transport. It is demonstrated that in the peripheral heavy-ion collisions the high-momentum elliptic flow is strongly sensitive to the momentum dependence of mean field at supranormal densities. The high transverse-momentum particles are directly and exclusively emitted from the high-density zone in the collisions, while remaining particles primarily continue along the beam axis. The elliptic flow was measured by the KaoS Collaboration as a function of the transverse momentum at a number of impact parameters in Bi + Bi collisions at 400, 700, and 1000 MeV/nucleon. The observed elliptic anisotropies in peripheral collisions, which quickly rise with momentum, can only be explained in simulations when assuming a strong momentum dependence of nucleonic mean field. This momentum dependence must strengthen with the rise of density above normal. The mean-field parametrizations, which describe the data in simulations with various success, are confronted with mean fields from microscopic nuclear-matter calculations. Two of the microscopic potentials in the comparisons have unacceptably weak momentum-dependencies at supranormal densities. The optical potentials from the Dirac-Brueckner-Hartree-Fock calculations, on the other hand, together with the UV14 + TNI potential from variational calculations, agree rather well within the region of sensitivity with the parametrized potentials that best describe the data.
No associations
LandOfFree
Determination of the Mean-Field Momentum-Dependence using Elliptic Flow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determination of the Mean-Field Momentum-Dependence using Elliptic Flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of the Mean-Field Momentum-Dependence using Elliptic Flow will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-430843