Quantal description of instabilities in nuclear matter in a stochastic relativistic model

Spinodal instabilities and early development of density fluctuations are investigated in the stochastic extension of Walecka-type relativistic mean field including non-linear self-interactions of scalar mesons in the quantal framework. Calculations indicate that at low temperatures T = 0-2 MeV, the initial growth of density fluctuations and hence the initial condensation mechanism occur much faster in quantal calculations than those found in the semi-classical framework. However, at higher temperatures T = 4-5 MeV,semi-classical calculations provide a good approximation for quantal description. Calculations show that the typical size of initial condensation regions is not very sensitive to the temperature, but depends on the initial baryon density. These findings are consistent with previous investigations carried out in the non-relativistic approach with an effective Skyrme interaction.


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The nucleon exchange mechanism is investigated in central collisions of symmetric heavy ions in the basis of the stochastic mean-field approach. Quantal diffusion coefficients for nucleon exchange are calculated by including non-Markovian effects and shell structure. Variances of fragment mass distributions are calculated in central collisions of Ca-40 + Ca-40, Ca-48 + Ca-48, and N-56 i+ Ni-56 systems.
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Spinodal instability mechanism and early development of density fluctuations for asymmetric hot nuclear matter produced in heavy-ion collisions are investigated in non-relativistic and relativistic stochastic mean-field approaches. In relativistic approach, a stochastic extension of the relativistic mean-field approximation based on non-linear Walecka model employed in a quantal framework. The mediator rho meson is added to the Walecka model in order to investigate the isospin dependence of the system. The gro...
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Citation Formats
Ö. Yılmaz Tüzün and A. Gokalp, “Quantal description of instabilities in nuclear matter in a stochastic relativistic model,” EUROPEAN PHYSICAL JOURNAL A, pp. 0–0, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62839.