Neutrino-pasta scattering: the opacity of nonuniform neutron-rich matter

Details Neutrino-pasta scattering: the opacity of nonuniform neutron-rich matter Neutrino-pasta scattering: the opacity of nonuniform neutron-rich matter

2004-01-07

arxiv.org/abs/astro-ph/0401079v2

Phys.Rev. C69 (2004) 045804

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures, minor changes to figures, Phys. Rev. C in press

Scientific paper

10.1103/PhysRevC.69.045804

Neutron-rich matter at subnuclear densities may involve complex structures displaying a variety of shapes, such as spherical, slablike, and/or rodlike shapes. These phases of the {\it nuclear pasta} are expected to exist in the crust of neutron stars and in core-collapse supernovae. The dynamics of core-collapse supernovae is very sensitive to the interactions between neutrinos and nucleons/nuclei. Indeed, neutrino excitation of the low-energy modes of the pasta may allow for a significant energy transfer to the nuclear medium, thereby reviving the stalled supernovae shock. The linear response of the nuclear pasta to neutrinos is modeled via a simple semi-classical simulation. The transport mean-free path for $\mu$ and $\tau$ neutrinos (and antineutrinos) is expressed in terms of the static structure factor of the pasta, which is evaluated using Metropolis Monte Carlo simulations.

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