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The data for 9.3 million Upsilon(2S) and 20.9 million Upsilon(1S) taken withthe CLEO III detector has been used to study the radiative population of statesidentified by their decay into twenty six different exclusive hadronic finalstates. In the Upsilon(2S) decays an enhancement is observed at a ~5 sigmalevel at a mass of 9974.6+-2.3(stat)+-2.1(syst) MeV. It is attributed toeta_b(2S), and corresponds to the Upsilon(2S) hyperfine splitting of48.7+-2.3(stat)+-2.1(syst) MeV. In the Upsilon(1S) decays, the identificationof eta_b(1S) is confirmed at a ~3 sigma level with M(eta_b(1S)) in agreementwith its known value.

Observation of eta_b(2S) in Upsilon(2S) -> gamma eta_b(2S), eta_b(2S) -> hadrons, and Confirmation of eta_b(1S)