Phases of hot nuclear matter at subnuclear densities
Abstract
Structure of hot dense matter at subnuclear densities is investigated by quantum molecular dynamics (QMD) simulations. We analyze nucleon distributions and nuclear shapes using twopoint correlation functions and Minkowski functionals to determine the phaseseparation line and to classify the phase of nuclear matter in terms of the nuclear structure. Obtained phase diagrams show that the density of the phase boundaries between the different nuclear structures decreases with increasing temperature due to the thermal expansion of nuclear matter region. The critical temperature for the phase separation is ≳6 MeV for the proton fraction x=0.5 and ≳5 MeV for x=0.3 . Our result suggests the existence of “spongelike” phases with negative Euler characteristic in addition to the simple “pasta” phases in supernova cores until T≲3 MeV .
 Publication:

Physical Review C
 Pub Date:
 May 2004
 DOI:
 10.1103/PhysRevC.69.055805
 arXiv:
 arXiv:nuclth/0311083
 Bibcode:
 2004PhRvC..69e5805W
 Keywords:

 21.65.+f;
 26.50.+x;
 97.60.Bw;
 61.20.Ja;
 Nuclear matter;
 Nuclear physics aspects of novae supernovae and other explosive environments;
 Supernovae;
 Computer simulation of liquid structure;
 Nuclear Theory;
 Astrophysics;
 Condensed Matter
 EPrint:
 13 pages, 19 figures