  The relaxation of the harmonical oscillator, being in contact with the
thermostat whose excitations can be treated as bosons is studied. An exact
temporary behavior of the inverse oscillator's temperature is obtained. In low
interaction limit the temperature behavior is exponential. When the interaction
is increasing the temporary behavior display oscillations. Narrow peak of the
oscillator susceptibility is discovered. The exact solution obtained is
compared with Bloch-Redfild approximation.
