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Instanton was found for Kraichnan model with 'frozen' velocity field. Largeorder asymptotic of quantum-field perturbation expansion for renormalizationconstant $Z_\nu$ was investigated. It was shown that this expansion isconvergent one. The radius of convergence was calculated.

Convergence of perturbation series for renormalization constants in Kraichnan model with "frozen" velocity field