Spinodal instability mechanism and early development of density fluctuations
for symmetric nuclear matter at finite temperature are studied. A stochastic
extension of Walecka-type relativistic mean-field model including non-linear
self-interactions of scalar mesons with NL3 parameter set is employed in the
semi-classical approximation. The growth rates of unstable collective modes
are investigated below the normal density and at low temperatures. The system
exhibits most unstable behavior in longer wave lengths at baryon densities
&rho / B = 0.4 &rho / 0 , while most unstable behavior occurs in shorter wavelengths at
lower baryon densities &rho / B = 0.2 &rho / 0 . The unstable response of the system shifts
towards longer wavelengths with the increasing temperature at both densities.
The early growth of the density correlation functions are calculated, which provide
valuable information about the initial size of the condensation and the
average speed of condensing fragments. Furthermore, the relativistic results are
compared with Skyrme type non-relativistic calculations. Qualitatively similar
results are found in both non-relativistic and relativistic descriptions.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12613472/index.pdf |
| Date | 01 August 2011 |
| Creators | Acar, Fatma |
| Contributors | Yilmaz, Osman |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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