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The results of the muon-spin rotation experiments on BCS superconductorsNbB_2+x (x = 0.2, 0.34) are reported. Both samples, studied in the presentwork, exhibit rather broad transitions to the superconducting state, suggestinga distribution of the volume fractions with different transition temperatures(T_c)'s. By taking these distributions into account, the dependence of theinverse squared zero-temperature magnetic penetration depth (\lambda_0^{-2}) onT_c was reconstructed for temperatures in the range 1.5K<T_c<8.0K.\lambda_0^{-2} was found to obey the power law dependence \lambda_0^{-2}\proptoT_c^{3.1(1)} which appears to be common for some families of BCSsuperconductors as, {\it e.g.}, Al doped MgB_2 and high-temperature cupratesuperconductors as underdoped YBa_2Cu_3O_{7-\delta}.

Correlation between the transition temperature and the superfluid density in BCS superconductor NbB_2+x