Neutrino scattering in heterogeneous supernova plasmas

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O. L. Caballero and C. J. Horowitz
Department of Physics and Nuclear Theory Center, Indiana University, Bloomington, Indiana 47405, USA

D. K. Berry
University Information Technology Services, Indiana University, Bloomington, Indiana 47408, USA

Received 26 July 2006; published 12 December 2006

Neutrinosin core-collapse supernovae are likely trapped by neutrino-nucleus elastic scattering.Using molecular dynamics simulations, we calculate neutrino mean free pathsand ion-ion correlation functions for heterogeneous plasmas. Mean free pathsare systematically shorter in plasmas containing a mixture of ionscompared to a plasma composed of a single ion species.This is because neutrinos can scatter from concentration fluctuations. Thedynamical response function of a heterogeneous plasma is found tohave an extra peak at low energies describing the diffusionof concentration fluctuations. Our exact molecular dynamics results for thestatic structure factor reduce to the Debye-Hückel approximation, but onlyin the limit of very low momentum transfers.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.74.065801
DOI:	10.1103/PhysRevC.74.065801
PACS:	26.50.+x; 97.60.Bw; 25.30.Pt 26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments 97.60.Bw Supernovae 25.30.Pt Nuclear neutrino scattering YEAR: 2006

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