Phys. Rev. Lett. 102, 230602 (2009) [4 pages]Positron Kinetics in Soft Condensed MatterReceived 22 March 2009; revised 30 April 2009; published 9 June 2009 We outline a new kinetic theory for positrons in soft matter, which blends together cross sections for positrons scattering from single molecules, with the structure function of the medium as a whole. Numerical results are presented for positrons in liquid argon, where negative differential conductivity arises from both positron formation and the structure of the medium. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.230602
DOI:
10.1103/PhysRevLett.102.230602
PACS:
05.20.Dd, 34.80.Uv, 36.10.Dr
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