Total cross sections of $K^{-}$ mesons in hydrogen and deuterium were measured over the momentum range 630 to 1100 Mev/c. The $K^{-}-n$ total cross sections were obtained from deuterium and hydrogen data. A well-defined resonance appeared in the $K^{-}-p$ total cross section at about 1000 Mev/c. Two high-resolution velocity-selecting Čerenkov counters were used to select $K^{-}$ mesons. The momentum resolution was within 1% to 2%, and the momentum intervals chosen were very closely spaced.

• Received 16 October 1961

DOI:https://doi.org/10.1103/PhysRev.125.1696