2001/09/18 by Bao-An Li, Andrew T. Sustich, A. Sustich +2
Earth and Planetary Sciences · Physics and Astronomy · #High-pressure geophysics and materials #Nuclear physics research studies #Quantum, superfluid, helium dynamics #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.64.051303
published as Phys.Rev.C64:051303,2001 · 11 pages and 4 figures. Phys. Rev. C, Rapid Communication, (2001) in press
arxiv created 2001/09/18 · openalex publication_date 2001/10/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Within nuclear thermodynamics and an isospin-dependent transport model we investigate respective roles of the nuclear mean field and the two-body stochastic scattering on the evolution of density and isospin fluctuations in either mechanically or chemically unstable regions of neutron-rich matter. It is found that the mean field dominates overwhelmingly the fast growth of both fluctuations, while the two-body scattering influences significantly the later growth of the isospin fluctuation only. Moreover, both fluctuations grow in mechanically unstable systems, while only the density fluctuation grows significantly in chemically unstable ones. Furthermore, the magnitude of both fluctuations decreases with the increasing isospin asymmetry because of the larger reduction of the attractive isoscalar mean field by the stronger repulsive neutron symmetry potential in the more neutron-rich matter. Finally, several experimental measurements are proposed to test these findings.