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In the present investigation (2002) the current-voltage characteristics(CVCs) of break junctions in polycrystalline $MgB_2$ samples have been studiedin the temperature range $4.2 K < T < T_c$. An inelastic Cooper pair tunnelingaccompanied by the emission of Leggett plasmons has been found for the firsttime in $MgB_2$ Josephson contacts. A fine structure in the CVCs of $MgB_2$Andreev point contacts caused by a resonant emission of Leggett plasmons hasbeen observed for the first time. An energy of the Leggett plasmon has beenestimated: $E_0$ ~ 4 meV. Distinct two-gap structures have been found in theCVCs of $MgB_2$ tunneling contacts and $MgB_2$ Andreev point contacts with 7.5meV $< \Delta_L <$ 11 meV and 1.5 meV $< \Delta_S <$ 2.5 meV. An intrinsictunneling effect (ITE) and intrinsic multiple Andreev reflections effect(IMARE) have been observed due to the layered structure of $MgB_2$. Theobtained experimental results give a direct evidence for a two-gapsuperconductivity in $MgB_2$. ("V. Tarasov's Readings", November 2002, Russia,Moscow, conference proceedings.)

Leggett's plasma resonances and two-gap structures in the CVCs of  MgB$_2$ break junctions $-$ a direct evidence for a two-gap superconductivity  in MgB$_2$