Diffusion-controlled annihilation $A + B \to 0$ with initially separated reactants: The death of an $A$ particle island in the $B$ particle sea

Details Diffusion-controlled annihilation $A + B \to 0$ with initially separated reactants: The death of an $A$ particle island in the $B$ particle sea Diffusion-controlled annihilation $A + B \to 0$ with initially separated reactants: The death of an $A$ particle island in the $B$ particle sea

2003-12-18

arxiv.org/abs/cond-mat/0312472v1

Phys. Rev. E 67, 060101 (2003) (Rapid Communication)

Physics

Condensed Matter

Statistical Mechanics

4 RevTex pages, 1 PNG figure and 1 EPS figure

Scientific paper

10.1103/PhysRevE.67.060101

We consider the diffusion-controlled annihilation dynamics $A+B\to 0$ with equal species diffusivities in the system where an island of particles $A$ is surrounded by the uniform sea of particles $B$. We show that once the initial number of particles in the island is large enough, then at any system's dimensionality $d$ the death of the majority of particles occurs in the {\it universal scaling regime} within which $\approx 4/5$ of the particles die at the island expansion stage and the remaining $\approx 1/5$ at the stage of its subsequent contraction. In the quasistatic approximation the scaling of the reaction zone has been obtained for the cases of mean-field ($d \geq d_{c}$) and fluctuation ($d < d_{c}$) dynamics of the front.

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