Abstract
In this paper, a constructive definition of entanglement for nonidentical particles is given. It is shown that particles arising in the process of inelastic scattering are entangled with each other. This property is a consequence of the symmetry of fundamental interactions. Considering detectors of elementary particles, it was concluded that only inelastic scattering can be the basis of a measuring instrument. In the process of inelastic scattering, the measuring instrument can acquire information about the particle (system), while in the case of elastic scattering, it cannot. The nonlinearity of inelastic scattering naturally solves the measurement problem in quantum mechanics.
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