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In this article a theoretical model for the η -mesic 3 He non-mesonic decay channels is presented. We present the resultant relative momentum distribution of bound 3 He - η as well as in-medium branching ratios of η → 2 γ and η → 3 π 0 , which are crucial for the Monte Carlo simulations of measured processes and thus for the experimental data interpretation. As an example we also apply the model for the estimation of the detection efficiency of the WASA-at-COSY detector. [ABSTRACT FROM AUTHOR]