Hyperfine structure splitting of the bound $S(L=0)-$states in the symmetric muonic molecular ions

The hyperfine structure splittings are determined for all five bound $S(L = 0)-$statesinthethreesymmetricmuonicmolecularions:$pp\mu, dd\mu$and$tt\mu$. The expectation values of all interparticle delta-functions used in our calculations have been determined in recent highly accurate computations.