[en] The behavior of nuclear matter in an external static field acting in a region of finite dimensions is investigated. It is shown that, at some critical value V/sub c/ of the field intensity, nuclear matter is expelled from the region in which the field acts. The quantity V/sub c/ is estimated, and found to be almost an order of magnitude smaller than the Fermi energy. The use of a mechanical analogy reveals that the equilibrium equation for nuclear matter in an external field can have three types of solutions simultaneously, namely, the traditional bubble and soliton solutions and a new, hybrid solution, and allows the solution at a qualitative level of the problem of localized hadronic states