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Results of the investigations of the yield of high-spin and low-spin isomersin reactions $^{41}$K($\alpha $,n)$^{44}$Sc, $^{86}$Sr ($\alpha $,n)$^{89}$Zr,$^{112}$Sn($\alpha$,n)$^{115}$Te, and $^{134}$Ba($\alpha$,n)$^{137}$Ce in theenergy range of the alpha particles 15 $\div$ 31 MeV based on off-beammeasurements of induced activity of members of the isomeric pair are presented.The anomalous behavior of the isomeric cross-section ratios for the first ofthese reactions is confirmed. Uniquely large isomeric cross-section ratios forthe second and third ones are obtained. The features of the fourth reaction,which are promising for its application in fundamental research, are revealed.Quality of the description of this dynamics by popular computer codes isanalyzed.

Experimental study of the relative probability of high-spin isomeric states population in ($\alpha$,n)-reactions