  In this work spontaneous (non-dynamical) breaking (effective hiding) of the
unitary quantum mechanical dynamical symmetry (superposition) is considered. It
represents an especial but very interesting case of the general formalism of
the spontaneous symmetry breaking (effective hiding). Conceptual analogies with
spontaneous breaking of the gauge symmetry in Weinberg-Sallam's electro-weak
interaction are pointed out. Also, consequences of the spontaneous
superposition breaking in the measurement process are discussed. Measurement
can be considered as a typical Landau's continuous phase transition with
spontaneous superposition breaking (effective hiding) effectively corresponding
to collapse. Here critical values of the order parameters are determined by
Heisenberg's uncertainty relations.
