We report on measurements of resonance strengths and energies for the E_p=151 and 193 keV resonances in the 18 O (p, α) 15 N and 17 O (p, α) 14 N reactions, respectively, obtained during commissioning of a new setup for alpha-particle detection studies at the LUNA underground laboratory. Our values, ωγ(151)=164.2±0.9_stat^+12.1_-11.7_syst meV and ωγ(193)=1.68±0.03_stat±0.12_syst meV, are in excellent agreement with those reported in the literature. New values of resonance energies are E_p=151.2±0.3 keV and …