In a new measurement of proton total cross sections at 3.00 GeV/c, the $p-d$ total cross section is found to be lower than a previous measurement by 1.17±0.09 mb. This implies a corresponding new value for the total cross section for $I=0\mathrm{}$ which is 2.18±0.27 mb lower than the previous value. Possible sources of systematic error are discussed.

• Received 4 November 1969

DOI:https://doi.org/10.1103/PhysRevD.1.2477