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The models of the $n\bar{n}$ transition in medium and nuclei based on the diagram technique for direct reactions, potential description of $\bar{n}$-medium interaction and field-theoretical approach are considered. It is shown that for the $n\bar{n}$ transition in medium field-theoretical approach should be used. The lower limit on the free-space $n\bar{n}$ oscillation time τ is in the range: 1016yr>τ>1.2⋅109s. [ABSTRACT FROM AUTHOR]

The model of $n\bar{n}$ transitions in the medium based on field-theoretical approach is considered. The time-dependence and corrections to the model are studied. The lower limit on the free-space $n\bar{n}$ oscillation time τ is in the range 1016yr>τ>1.2×109s. [ABSTRACT FROM AUTHOR]

The $n\bar{n}$ transitions for the neutrons in bound state are studied. The |in〉-state of nucleus is described by single-particle shell model. The dynamical process part is calculated by means of field-theoretical approach with finite time interval. The results are the same as for nuclear matter. [ABSTRACT FROM AUTHOR]