  Experimental support is found for the multiband model of the
superconductivity in the recently discovered system MgB2 with the transition
temperature Tc = 39 K. By means of Andreev reflection evidence is obtained for
two distinct superconducting energy gaps. The sizes of the two gaps (Delta_S =
2.8 meV and Delta_L = 7 meV) are respectively smaller and larger than the
expected weak coupling value. Due to the temperature smearing of the spectra
the two gaps are hardly distinguishable at elevated temperatures but when a
magnetic field is applied the presence of two gaps can be demonstrated close to
the bulk T_c in the raw data.
