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The nuclear level density and $\gamma$-decay strength of $^{192}$Os have beenextracted using particle-$\gamma$ coincidence data from the$^{192}$Os($\alpha,\alpha^\prime\gamma$)$^{192}$Os reaction by means of theOslo method. The level density is found to be a rather smooth function ofexcitation energy, approximately following the constant temperature model. The$\gamma$-decay strength is compared to photoneutron cross-section data abovethe neutron separation energy, and to $E1$ and $M1$ strengths for nuclei inthis mass region derived from primary transitions following neutron capture.Our results are in good agreement with these previous data and draw aconsistent picture of the $\gamma$-strength function in the range $E_\gamma\approx 1.5-6 $ MeV.  Using the measured nuclear level density and $\gamma$-decay strength as inputto the nuclear-reaction code TALYS, we provide the first experimentallyconstrained Maxwellian-averaged cross section (MACS) for the$^{191}$Os($n,\gamma$)$^{192}$Os reaction relevant to $s$-processnucleosynthesis. The systematic uncertainties introduced by the normalizationprocedure of the level density and $\gamma$-strength function were investigatedand propagated to the calculated Maxwellian-averaged cross section. Theobtained result of the Maxwellian-averaged cross section at $k_BT=30$ keV,$\langle \sigma \rangle_{n,\gamma}=1134\pm 375$ mb, is in very good agreementwith the theoretical estimate provided by the KADoNiS project, givingexperimental support to the adopted KADoNiS value. Good agreement is also foundwith MACS values obtained from other libraries, such as TENDL-2017,ENDF/B-VII.0, and JEFF.

First experimental constraint on the $^{191}$Os$(n,\gamma)$ reaction rate relevant to $s$-process nucleosynthesis