Search

Inclusive data for the production of γ rays and π 0 are presented from an experiment with a 4 GeV/ c π + beam, using a track-sensitive target. The results are compared with data at other energies and with π + and π − distributions.

The Track Sensitive Target technique has been used to isolate 5000 events from the reaction π+p→π+pπ0π0 at 4 GeV/c. Channel cross sections are measured. The data agree with predictions from phase-shift analyses of π+π− data: the effect of the S∗ is clearly seen. There is strong evidence against any narrow ϵ below 1 GeV/c2.

In an experiment using a heavy liquid bubble chamber the Ξ hyperon lifetimes and α parameters were measured to be τΞo = (3.04 ± 0.230.26) × 10−10 sec, τΞ− = (1.73 ± 0.070.08) × 10−10 sec, αΞo = −0.84 ± 0.27 and αΞ− = −0.42 ± 0.11. These values agree with measurements which employed different techniques and are consistent with the predictions of the ΔI = 12 rule.