Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00258 : Towards a phase diagram for accreting neutron star crusts: total energy calculations of close packed lattices
Author:
Neutron star crusts are somewhat less exotic
than their cores, but may still play an important role in observable
astrophysical phenomena, such as pulsar glitches and cooling
rates. Recent
nucleosynthesis calculations of accreting material being burned
and buried
on a neutron star crust indicate the possible presence of many
species,
ranging from around Z=8 to Z=34. In the outer crust regime where
these
species are completely pressure ionized and have screened-Coulomb
interactions due to the relativistic Fermi electron gas, we
expect some
close-packed lattices may have a lower free energy than the bcc
structure
that is usually assumed to exist. Our poster shows the results of
ground
state energy calculations for several candidate binary and ternary
close-packed lattices. We compare these ground state energies to
those for
pure phase separated bcc and fcc structures.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.258
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